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6l6 calibration tube

6l6 calibration tube • Shared 3-band EQ with Bass, Mid and Treble. Set up the tester maunal testing a 6L6 tube and put in a known good, non gassy 6L6 tube. P s: Screen grid power dissiparion at operating point. Handling a batch of Guiguang tubes Valve Amplifier Line Magnetic MeiXing Ming Da Vaccum Tube Sort by type 101D 205D 25 45 50 5AR4 6146B 6SL7/ECC35 7025 EL156 810 KT77 102D 12AT7/ECC81 12AU7/ECC82 12AX7/ECC83 12BH7 211 274B/5U4G/5Z3P 2A3 300B 350C 50CA10 572B 5881 6550 6L6 6SN7/CV181 6V6 805/805A 807/FU-7 811A/FU-811 812 845 EL34/6CA7 EL84 KT66 "an illuminated bias meter on the amp's front panel is intended not to aid in calibration but to provide confirmation that the 300Bs are operating within their intended range" quoted Art Dudley. 10) Posted by mission@cbn. So, here is a rundown of how these tubes differ in sound. High gm tubes such as 6DJ8, 7308, 12GN7, etc, are often factory spec'd to as wide as a -20 +40% tolerance in gm. 6l6 Calibration Vacuum Tube - For Hickok 800 800a And Others - 5100 µmhos - New. Plan on Will also test most common audio tubes like 6CA7, 6L6, 6SN7, KT88, 7247, 12AX, AU, AT, 7247, 7199,7355, 7591 and 7868 (with adapter). "This Two tubes, though, still forces the receiver to rely on a regenerative detector. Turn the amplifier to "on" with the HI/LO Switch in the HI position. Calibration Testing of the Hickok Model 539C by Daniel Schoo . First station was a Hallicrafters S-85 and a homebrew 6L6/807 crystal controlled transmitter that only had coils for 80 CW. Even a stable detector over loads easily on today's ham bands. One of the members had suggested building a Super Simple Single Stage Preamp (“4S” Preamp for short) and there was much discussion concerning various tubes, gain, noise, etc. This is a Hickok 605A tube tester in good working order. I changed the amplifier to Ultra-Linear operation by connecting the Ultra-Linear tap tube end user, are in correct calibration and if the gm data is accurate? One method is to have the gm tester sent to a Calibration Service from time to time for checks and adjustments and trusting the workmanship & skills at that facility. 6SN7GT and 12AU7/6DJ8), power tubes (5V rectifier and a single 2A3/300B triode), and a blank board with two octal and two noval sockets for accommodating other types. The filament voltage should be somewhere around 6. At the time Philips had already developed and patented power pentode designs, which were rapidly replacing power triodes due to their greater efficiency. Put the tube in the tester and set it up for the standard 6L6 test. SET UP All values for plate, screen, grid signal, etc, are in spec. However, I can find no one offering calibration tubes on the internet who addresses or even seems to be aware of this potential problem. Because of this, there are many versions by different manufacturers. Hickok 539B/C Mutual Conductance Tube Tester - Checkout and Calibration C and ) . c. Adjust the BIAS VOLTS control to 3. He and his partner, Greg, only work on better testers and analyzers, such as Triplett, AVO, Hickok 752 to 539C, plus KS and RD, and a few "reference" units from Europe. Tested a 6L6 calibration tube that tests with almost exact Gm at 5500 and the tube calls for a Gm of 5475. For someone wanting to start a tube selling business this would be a great test unit to have restored, you could absolutely start a professional caliber tube selling business with this tester but you have to invest the money to do it right this unit needs a full restoration and calibration by someone who knows what they are doing. But if you haven't, and are searching for something "simple," look before you leap! Yes, those single-tube 6L6 rigs look awfully simple on paper. Three channels of road-tested sound work for any playing style—crisp cleans, chunky overdrive, tight Meters in Tube Transmitters. The 3-500Z is a relatively inexpensive tube and has been around for a long time. All values for plate, screen, grid signal, etc, are in spec. These tubes are tested for shorts / gas before calibration A few common tube testers that have µmhos readout on HICKOK TUBE TESTER & Tv-7 6L6 Calibration Tube -- #B - $34. 1 was an 80 Watt input power transmitter that used a metal 6L6 crystal controlled oscillator and two parallel connected metal 6L6 tubes as the PA. The Calibration Reference 6L6 he is looking for should have a reference reading verified to an accurate standard that then can allow this tube to serve as a reference standard to be used to verify the accuracy of his tube testers. Knowing voltage some distance away, even a few inches, is not correct. For the next test I use a 6V6, a 6L6 is specified in the manual, this is the gas test. 3V between pin 2 and 7. No All values for plate, screen, grid signal, etc, are in spec. Excellent B&K model 747B tube tester. This tube tester features a clever voltage control circuit that eliminates the need to constantly set the AC line level to insure accurate tests, regardless of line voltage variations. Many Hickok testers can be calibrated, but the heater voltage drops below 6 volts when a tube is in the socket causing inaccurate test results. Tube Guitar Combos at Europe's largest retailer of musical instruments - fast delivery, 30-Day Money-Back Guarantee and 3-year Thomann warranty Served with love! Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. Hardest part is finding the crystals. Famous for the low-end headroom characteristic of 6L6 tubes and a versatile all-12AX7 tube preamp, it also boasts luscious Fender spring reverb, an effects loop and more. Also I included plots from a nice 1971 Heerlen CV492/ECC83, a Mullard EL95 (most likely from 1975), a RFT EL34 and also a RCA 5879 :-) The Hot Rod Deluxe III is a 40-watt single 12” combo - the standard for gigging guitarists worldwide. The reading(s) should be very nearly identical. I tested about 40 tubes I have, Ei, New Mullards, JJ, Chinese, Ruby (Like I said Chinese) sovtek 7025, Ge Nothing tested higher than 103 and the only one side. 2. You CAN use ANY brand of tube so long as if fits the As an example… a simple tube matching unit such as the Maxi-Matcher will test a tube at 400 plate volts and -48 bias for 6L6 tubes. I insert my 6L6 Bogey tube in the 8 pin octal socket. Bud is a protégé of the late Chris Haedt, who was recognized as the leading expect on tube tester calibration and repair. 6% similar) Ge 6l6 gc black plate dd getter tube tested Hickok 533a gm is average new no shorts or gas tested at gm returns for defective or item not as described all testing values stated are mine not factory. The unit is fully operational with new capacitors installed. When 6L6 is not installed, there is 6. 10 6L6 tubes connected in parallel. Now, there are the tubes that were manufactured for FM commercial service. If you test the same 6L6 on a model 600A it might test 5000--but would probably test close to 6000 on a 539C. 6k for the 2x 6v6 tubes, 4k for the 2x 6L6 tubes, and 2-3k for the 4x 6L6 tube amps. 3. Comes with copy of original manual / tube chart / schematic. $55. Served with love! Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. ) RMS voltage at tube pins in a fully warmed amplifier for a given power line voltage. 180) I recently bought a B&K 707 tube tester and calibrated it by following the instructions in the manual but it still measures too high. . Telefunken Fisher 12ax7 Ecc83 Hickok 5-feb-2016 - Find great deals on for nikko and nikko morris. Tested a 6AX7 calibration tube that tests at 1400 and 1450 Gm and the tube calls for 1400 and 1440 Gm and are pictured. Tube Amp Head for Electric Guitar All tube, 3 Channels, Power: 50 watts, Tubes: 2x 6L6 and 7x JJ ECC83S (12AX7), Common controls for channels 1 and 2: Volume and Gain Dual Concentric, Low, Mid and High, Further The tester works for all popular octal-base output tubes (6V6, 6L6, EL34, KT66, KT77, KT88, 6550, and more). See page on power supply design. The tester works, but as ALL testers in un-restored condition, it will need some attention. So far so good. tubes that don't test as strong do seem to correlate with not working in this test. Note: 6L6 output tube version (Dated 1960's) ($15) Ampeg G-15 Gemini II Tube Amplifier (v7591) Schematic Contents: Schematics, Specifications, Troubleshooting Guide / Fault Diagnosis, Calibration / Alignment Instructions, Voltage Check Points, Tube Layout Chart, Parts List. Title: 6L6GC Author: Tung-Sol Subject: FP-2005-05-28 Created Date: 5/29/2005 12:23:29 AM • Set tester to test a 6L6 (Filament 6. 224. I tried a couple of other 6L6 tubes, and one of them made it all the way to 120 in the test. Moreover, matched sets command a 50%-100% premium over single tubes. The lows are deep without being muddy, while the top end is very detailed without being as bright as other tubes in this price range. Antenna was an end fed wire tuned by a homebrew tuner built on the end of my mom's old wooden ironing board. The calibration tube is used in the final adjustment of the tester. I checked the calibration as shown in picsBias voltage spec is 2. The prices of vintage tube testers have risen to levels unimaginable just a few years earlier. The amp’s transformers keep the heartbeat of the amp100% Italian and are custom made by Onori. Such a converter needs only 2 or 3 tubes. Calibration resistors are still within spec. Ltd. I tried a couple of other 6L6 tubes, and one of them made it all the way to 120 in the test. ) and adjust R115 until meter reading matches calibration tube • Repeat 6AU6 & 6L6 calibrations one more time, re-adjust as needed To make the adjustment, make sure the tube tester meter is *level, tube in the socket, then adjust the line voltage so that the voltage reading on the heater of the 6L6 is 6. GAS TEST 16. Calibration Instructions From Hickok Includes Calibrated 6L6 Tube (REQUIRED) $25. Very clean and in excellent shape as can be seen. Path: /hickok/800a/ This is the BAMA archive. JJ-6L6GC This tube will work well in any guitar or Hi-Fi amplifier. No sticky meter movement. We use brand name tubes such as RCA, Sylvania, Tung-Sol, etc. I’m chasing the Gilmour tone but not using a tube amp. 2% similar) Great for making matched sets of amplifier tubes. This is more accelerated on output power tubes like This is a suitable replacement for any 6L6 tube type. They are reliable, sound great and perform well. I decided to plug 6L6 tube back in and use the alligator jumper wire and connect pin 2 and 7 to corresponding wire on the switch bank. 23 which there is no SPEC for in any Hickok manuals (with a tube in the socket), but critical to get accurate test results. The boxed items are New original Old Stock pre amp tubes , and offer replacement for top level Pre-Amp section, one has both GT and CAN choice, for the 9-pin, one tube is used and good, and offers a NOS choice as well. It's entirely tube-based inside, using two 0A2 glow tubes as voltage references. Be careful, if you put 12V on a tube with 6V heaters, you will likely damage the tube. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing Depending on the tube type, variations of 10 to 20% can be expected to be seen, even for unused tubes,generally the higher the Ik or gm, the wider the variation that one can expect. The tuning dial is 8" in diameter. The Measured Voltage Gain Test Setup Each tube sample was installed in the same custom built, fixed bias single-ended guitar amplifier (see schematic) with a Fender black face style preamp circuit. For example, a new tube goes off the scale (beyond 120). Amplifier Type: Tube Control Knobs: Vintage-Style Skirted Black Plastic Inputs: Two - (1/4", Input 2 operates at -6dB) Cabinet Material: 7-ply 3/4" Meranti plywood Handle: Molded Plastic Strap with Nickel-Plated Caps Speakers: One - 12" Celestion NEO Creamback Total Impedance: 8 ohms Power Tubes: 2 x 6L6 Preamp Tubes: 3 x 12AX7, 2 x 12AT7 El Cajon, CA (619) 444-7717 - Mon thru Sat - 9 AM to 5 PM PST | Ogden, IA (515) 275-4050 - Mon thru Fri - 9 AM to 5 PM CST Calibration Function The Calibration function (410--480 Hz) supports a wide range of standard pitches, and can be adjusted in 1 Hz steps for accurate and flexible tuning to any song or key. 5. The revival of tube technology in guitar and audiophile amplifiers has also led to the renewed interest in vacuum tube testers and their ultimate purpose, testing and matching of audio tubes. This did prove the concept. The 6L6 is a new tube, burned in for 12 hours to 96 hours as required to ensure it is operating within its most stable parameters. All values for plate, screen, grid signal, etc, are in spec. Mesa Boogie 6L6 STR441 Endstufenröhre, 1 Pair- gematched, Caution It explicitly does not matter with which color code of the tube amplifier was originally delivered. There is no need to modify the amp or tube sockets. Sounds like a real cal problem here to me!!!!! Take care and many thanks. I have several NOS 6L6 that test fine on my old 752. The filament is not glowing at all, 0V is measured between 2 and 7. Converter #3 use in 6L6 position, can test much more different types of tubes (E282F, 6AH6, 6AK6, 7233, D3A, E810F, CK6485 and all their compatibles) + $150 All information on this website is copyrighted by Space-Tech Lab. 3 volts. Because of this voltage limitation, it’s use is limited mostly to 6V6, 6L6, and EL84 type tubes, though we do have the full assortment of test adapters for testing other tube types on the Maxi-Matcher. power tubes. 495Signal voltage spec is 1. These amplifiers most often have a switch to change the bias range between these tubes. So if a tube was properly made and tested when new, all one needs to assess its current state is a simple emission tester. 6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. The 6L6 all-tube power that roars from the Randall RD45H can handle a number of styles. The photo shows the tester in action with a ‘43’ tube. 5v, this is at 1. (glass tube or metal no mind) 6000 is par. It is also interesting to note that by 1958 the entry novice transmitter shown in the ARRL Handbook was a 3-band 6DQ6 transmitter running 35 watts. No Bogey tube needed. The Trinity is a true three channel, 100-watt amp, with its power delivered via four EL34 power tubes. tubes that don't test as strong do seem to correlate with not working in this test. Smooth full scale operation. The tube test good. Repair and Calibration A second and more important reason for the variation may be that the final calibration of 539B and C models is done with a 6L6, a tube that draws relatively high current. Clipped across the tube is a setup to short the two specified pins with a 1mohm resistor during the gas test to bring it up exactly 1 division. Lid is missing. The unit is fully operational with new capacitors installed. So the Russian 6L6 has no test data with it, and the RCA 6L6 is fully tested on all testers. Amplification factor of a tube at operating point. Hickok 534 Tube Tester. . Single/Dual Cabinet Options with independent mic selection, polarity, panning and level control. 6L6 tube in picture is NOT Included, to show that it is working only. 5v, this is at 2. It was designed and constructed by William Moneysmith, W4NFR. 2pc Tube amp bias tester for el34 6v6 6l6 kt88 6550 5881 7024 "mV"test mode. I s: Screen grid current (tetrodes and pentodes). This tube has been calibrated using a known good laboratory grade tube tester serviced and calibrated by a professional. . 99 $ 105. Update: I changed the Chinese 6L6 tubes to JJ 6L6GC and the Chinese 12AX7B tubes to EH 12AX7 tubes. • All-tube 20 Watt Class-A guitar head. Oct 27, 2018 #2. Model/Type. It would have been a great legacy and we might still the pleasure of having many those original calibration Tubes around. A few minutes of playing with the two tube superhet on 40 meters convinced me that a BFO was needed for reasonable CW and SSB reception. Testing has been carried out with these tubes so far, 6L6, 6V6, 6F6, EL84 and a EL34. Its does use a 0-120 quality scale rather than reading true GMhos, which seems to be a major hangup with some people. 84. Calibration resistors are still within spec. It is plenty powerful and has that rich tube sound. The minimum GM 48 Tube tested at 78 The minimum is equal to 65% of a new tube. Acoustic G60T-112 Tube Guitar Amplifier Service Manual Contents: Schematics, Introduction / Features, Specifications, Controls, Functions & Theory of Operation, Front / Rear Panel Illustrations, Parts List. For example, in the originals, these 4 common tubes appear in this order: 1B3, 6L6, 12AU6, 35C5. sarsradio. Transconductance calibration notes by Daniel Schoo . So it gave me a set of known tubes. ^^ I just tested a bunch of new 12ax7, 12at7, 12au7, el84, 6v6, 6l6. I keep a Hickok 539B, and after going through the calibration process, once, I have a 6L6 and an 80 that I tested over twenty (20) years ago. Block Diagram . P a: Anode power dissipation at operating point. If you have an amplifier that can use either 6L6 or EL34 tubes, you will quickly notice that 6L6 tubes are more "Fender", where EL34 tubes are more "Marshall". Switchable Tube setting on Rhythm channel (6L6 or EL34). Complaint 3: Tube testers, especially B&K and Hickok, have calibration procedures that are readily available, and not that difficult to follow, online. No signal. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. Calibration date 09/03/20 by Daniel Nelson. It is perfect for checking the results of your calibration on any brand of tester as well. This is certainly not the case with the older D-201. Input Calibration. The calibration tube was the LAST step of the calibration procedure. I'm not saying the posters are incorrect, however, using other branded tubes that fit the criteria of the amp is NOT an issue. These systems are designed to be safe for the equipment and safe for the operator. 5]. Using RCA book spec 250 plate volts is used with a -14. Hickok 510X dynamic mutual conductance multi-tester tube tester [4*T-47. The Supro 1650RT Royal Reverb is the flagship tube amplifier of the Supro line. Comes with tube data and copy of manual. And always check for shorts before testing a tube. Guide to tube tester repair and calibration. The tester works for all popular octal-base output tubes (6V6, 6L6, EL34, KT66, KT77, KT88, 6550, and more). 1996-2020 and may not be reproduced in part or in full without written consent from Space-Tech Lab. The amp’s transformers keep the heartbeat of the amp100% Italian and are custom made by Onori. The point is that the size of the offset error will also vary depending on the bias voltage being used for the measurement as well as the transconductance of the tube itself. All tested well into the good range. G (rk) Gain of a single stage amplifier with cathode resistor. The Trinity is a true three channel, 100-watt amp, with its power delivered via four EL34 power tubes. 3V with the tube filament hot. 26) Posted by kudret on 2002-11-12, 18:36:43 (65. 512Meter bridge was perfectI showed some tests with a 6L6 , 12ax7, and a 6v6,&nb Meter Calibration; Microphones For AM; Negative Cycle Loading; Neutralize Your Transmitter! Modulation Monitoring; Splatter; Subharmonics in Vintage Equipment; Transmitter High Voltage Arcs; Ideas for Building a Pine Board Rig (Presented at the AWA 2018 Convention) Class C RF 6L6 Tube Data Tektronix 570 vacuum tube curve tracer, style 1. The bottom line is do not buy this tester for its looks – buy it for its capabilities. Case shows some wear. This means that for all of the 539B and C units, test results for the 6L6 calibration tube were the same. Will be well protected for shipping. 87 Humble Beginnings. As you use your tube amp, tubes wear out due to the heat it generates. This was an incredibly fun and rewarding project. Around the drum is chart paper calibrated in 5 second/24 hour lined increments. That will require a tube tester of a later design since the TV-7 pre-dates sweep tubes. 7% similar) Great for making matched sets of amplifier tubes. This circuit uses a great deal of negative feedback in order to supposedly get more linear response with cheap output transformers. Insert a calibrated *6L6 tube into the octal socket and allow it to warm up for a minimum of 5 minutes. , from time-to-time. Customers Who Viewed This Item Also Purchased 6L6 tube is a very popular output tube in guitar amps. To use this calculator to compute your loadline, with parallel tubes, simply specify n-times the overall load. 6L6 Vacuum Tubes at Europe's largest retailer of musical instruments - fast delivery, 30-Day Money-Back Guarantee and 3-year Thomann warranty Served with love! Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. Obtain a 6L6 tube that is known to be free of gas. 92. The two tube superhet became a three tuber. This applies to all models using a grid drive. Measured with an accurate DMM loaded properly to match the conditions spec'd in the military manual. 6L6 EL34 6550 GZ34 5U4. This is our new 2015 advance design, a tube tester with build in microprocessor control, automatic tube tester for beginner and professionals, you don't need to operate a very complicated vintage tube tester just to test out a simple tube, this unit can test both emission(mA) and dynamics Transconductance(uS) at the same time, it can also display both section of a dual triode testing result Note: NO 7581A tubes and NO 6L6 are in ANY “boxed items ” – it ships with 2 7581′s in socket only. Note: For actual 0Z4 rectifier tube tests the REPLACE ? GOOD scale is read for the test results. Many Designers and Researchers are conviced that Spice Tools can be a "tremendous boon" for Vacuum-Tube projects. One unique feature is an auxilliary on/off switch that the lid controls--when you close the lid the tester turns off! All measurements are equal to microtracer v3 biz only up to 400 volts and 600 mA current after modification. Tests perfectly with 6l6, 12by7, 6au6 and other tubes, see photo. Seven 12AX7 preamp tubes shape the tone of the amp’s three channels as well as the tube-buffered effects loop. tube tests the REPLACE ? GOOD scale is read for the test results. Its output at the lower plate voltage would have been similar on 80 meters. P rk: Power dissipation of cathode resistor. I always prefer fixed bias as much as possible for better sound. 6000 Hickok Model Dynamic Mutual Conductance Tube Tester (36. Nearly all the way to the right on the meter. Ltd. Telefunken Fisher . WB2MIC 6L6 Transmitter Project. Those tested bad. Those specs are built into the tube and will remain constant as the tube ages. With the circuit above, since the screen rises to ~400 volts, cathode open key voltage will be somewhere up around 75 volts. The subject tube, 6L6 DIY 6L6 / 5881 Single-Ended (SE) Tube Amplifier - 9 February 2010 This fantastic looking tube amplifier was put together by Mr. Cost of the 2E26 would have been high at the time. Get the most from you tubes — and amplifier — with a VHT Tube Tester 2. (Instructions included). Instead they test 4000. For example, to setup a 6L6: level 4 is moved to X, lever 3 is moved to Y, lever 5 is moved to Z. One 6L6 that has been marked with its µmhos (umhos or micromhos) values to be used in calibrating tube testers that have a µmhos readout on their dial. 74. they're expensive, and there doesn't appear to be an industry standard for what "matched set" means. $105. If you've ever juggled both a single-tube transmitter and an antenna, you'll know what this is all about before we begin. g. These tubes are about four times higher plate dissipation then the 6AQ5 or 6BQ5 used in any other CB output stages. The key is to use correctly matched power tubes that fit the criteria of the amp. Seven 12AX7 preamp tubes shape the tone of the amp’s three channels as well as the tube-buffered effects loop. The radio was a powerhouse with a 6L6 modulating another 6L6 and a power supply with plenty of headroom. A simple 8-watt power amp that uses a 6SH7 input tube and a single 6L6 output. I used the instructions "Calibration Testing of the Hickok Model 539C Mutual Conductance Tube Tester" by Daniel Schoo, Version 4. Tube not Picture 13 shows the filament voltage with the 6L6 tube in the socket at 6. 0 out of 5 stars 10. All you need to do is monitor the condition on the cathode coating, which is easily measured via emission. 6SL7, 6SN7 and 6L6 RCA are tested on a range of perfect tube testers, and documented results. Measured with an accurate DMM loaded properly to match the conditions spec'd in the military manual. The filament start glowing nicely. 5% similar) I will email the winner with scans of instructions for calibrating a 600 or 600a Hickok as outlined in a Hickok company bulletin on calibration, calibrating a 533 or 533a Hickok as outlined in a Hickok company bulletin on calibration, and the calibration instructions for a 6000… Vacuum Tube - 6L6, Electro-Harmonix, Apex Matched Quad. completely untouched. See full list on tubesound. Posts: 13,267. Note: Tube List: 12AX7A, 12AX7A, 12AT7, 6L6, 6L6 (Dated 1981) (16pages/$20) This signal is then imposed onto the control grid of a 6L6 power amplifier tube. This is a block diagram of a typical metering circuit. Thus a 6L6 “calibration” tube from such a source could be as much as 1000 micromho in error without them or the buyer even being aware of it. com This Hickok 1575 includes a very nice resistance decade box included for self bias tube tests. A 50-watt ultralinear power amp using 6550 power tubes. So thinking along the line Mickeydg5's reply a bit over 100 on the TV-7U would represent one of those power tubes putting out 100%. I will include a 6L6 tube, a 6C4 tube and a 10W2K ohm resistor that are necessary for the calibration. As a point of reference, a single Groove Tubes 6L6 sells for less than $20, while a quartet sells for $140. seen as dial above % I turn on the tube tester now. I tried a couple of other 6L6 tubes, and one of them made it all the way to 120 in the test. 0 volt bias. For Sale: $350 . GTR Comp – No-frills compressor pedal. but yeah, i was confused if i was setting up your calculator wrong, because every time i plugged in a Older Tube Test Data - Hickok Reprint of older tube data from roll chart dated Oct. Notes on Making an Accurate 539C Calibration Tube by Daniel Schoo . It seems to be out of calibration as it reads a bit high when testing a 6L6. Shop with confidence. tubes that don't test as strong do seem to correlate with not working in this test. Release P2. Ken's Triode Tube Tester 2016. There is no need to modify the amp or tube sockets. A spec tube would produce 72mA. 12 tubes total which includes the Amperite 3-4 ballast tube. 9) 2. The factory used a calibration tube — a real tube — a 6L6 of known value — and marked the Shunt dial according to the micromhos reading of that tube. Sky Box – Boutique I am aware of that the 350B is similar to a 6L6 tube and (that being said also in the book "75 years of WE tube manufacturing"), but on the two tubes which I wanted to test on the 6L6 settings the me . (January 16, 2020) – EVH® today announces the all-new 5150III® 50S 6L6 Head and 5150III® 50S 212ST Cabinet. • 20 Watts / 2 Watts built-in attenuator. GAS TEST 16. between the tube and the pcb and line it up flat, then soldering a few pins to keep it that way while soldering the underside. No calibration is needed , no setting for any tube testing required, just select the proper tube model by pressing the "TUBE" button to rotate thru different models, then press "SEL" to start the testing. The next day I will test some audio tubes el 34 el 84 6l6 6p3s kt66 and some double triodes ecc 83 85 88 and Russian equivalent 6n1p 6n2p and 6p3s. • No-Bias feature for swapping tubes without calibration. I got my novice license in 1959. Comes with 2-7pin miniature sockets, 2-9 pin miniature sockets, 2-loctal, and 2 octal sockets for testing. G (rk=0) 6000 Hickok Model Dynamic Mutual Conductance Tube Tester (39. Some difficulty has been encountered with 6L6 tubes in this amplifier. The grid of the 6SJ7 is connected to a network All Tube Combo For Electric Guitar 3 Channels: Clean, Crunch and Lead, Speakers: 2x 12" Celestion EVH Custom, 8 Ohms, Power: 50 W, adjustable up to 1 W, Tubes: 2x JJ 6L6 and 7x JJ ECC83S (12AX7), Channel 1 and 2: I actually did just that. Some people use 2 sided sticky tape or something to permanently hold the Nutube, especially if it's going to be shipped, I have used hot glue, works just fine. 67V (90%). The DIY enclosure is constructed from aluminum sections and the audio output transformer covers are built using copper clad board. As can be seen from figme 2, the grid voltage of the 6L6's will vary with the grid of the 6SJ7. Adjust the AC line voltage if necessary. The motor output is geared down by a factor of 6 to rotate a drum at 300 RPM. Has built-in tube pin straightener. BobbyZ Doctor of Teleocity. If the stop button is held This piece of equipment is used to match up to 4 power tubes with pre-selected bias points and plate voltages selectable between 325V and 400V. This corresponds to the tube elements in a 6L6: Pin 3 = Plate, Pin 4 = Screen, Pin 5 = Grid. I got one from JJ if I recall, and I use it for a "rough" calibration tube and a tester of the tube tester. GENERAL TERMS AND CONDITIONS I thought my Eico 666 tester had gone bad. Either a misprint or the original tester is badly out of calibration . 20877-1 by Daniel Schoo … 86. In this case, the ONLY hard criteria are 6L6/5881 tubes and that they be matched. Set the ENGLISH control to 73. All I could find was a 2 A regular fuse, but the normal draw is about 1/2 A. The 6L6 is a 6. B. The Trinity is a true three channel, 100-watt amp, with its power delivered via four EL34 power tubes. Scottsdale, Ariz. One other option is to buy a “Calibration Tube” or CT with a known gm. 96. That it works does not make it a good idea. Really the only model that requires the calibration tube is the 539--which uses a rather unusual calibration control in the 5Y3 circuit. Converter #3 use in 6L6 position, can test much more different types of tubes (E282F, 6AH6, 6AK6, 7233, D3A, E810F, CK6485 and all their compatibles) + $150 . The solid state tube also eliminates 15-watts of heat that would have been generated by a real 83 inside the closed up cabinet, and it helps the tester hold calibration longer. With higher current filaments, it is critical to know the voltage on the tube pin. Tube indicator roller works fine and smooth. You might just want to order a brand new 6L6. I noticed that the test for 6L6 amongst others reads low. It will make just about 100 watts output on the lower bands and a little less on 15 and 10 meters. 44. Each tube has an anode dissipation of 500 watts, 20-Watt grid dissipation and plate voltage up to 4000 volt. The Dumble Steel String Singer Amp – [At times you can find it here or here] As I mentioned the minimum value for KT66's and 6L6's is 50 on the TV-7U scale which would be 65% output for a KT66 or 6L6. This is different than the original documents, which were mostly by filament voltage. The tube is used to check accurate calibration on any tube tester and used to calibrate the tester. It appears to be in calibration according to my two 6L6"calibration tubes" pictures 3 and 4) The meter has been tested from zero to full scale and works perfectly. Two 6L6 beam power pentode tubes are the series-pass elements, and one each 6BH6 (power pentode) and 6X4 (full-wave rectifier) complete the complement. The Trinity is a true three channel, 100-watt amp, with its power delivered via four EL34 power tubes. The beam tetrode design of the 6L6 allowed RCA to circumvent Philips' pentode patent. For this, I ued my METRIX 310CTR tube tester that allow that procedure, and cross-checked with a tentatively tube tester bench, using my regulated HV PSUs. A super value compared with TV-10 and TV-7. 3v, HS5-3481, Bias 23, Range D) • Insert calibration 6L6 tube, let unit warm up a good 5-10 minutes • Perform line set adjustment (button 1 & line adjust knob) • Press 3 (Mut. ) What you do is to convert a BC-453 (the one that tunes 190-550 kHz) and put a crystal-controlled converter for 80 and/0r 40 in front of it. Results are the same as my main tester I know to be accurate . It never gets used for anything else, so for me, it's plenty close to a test fixture. This Hickok 1575 tracks well. Adjustment is as follows: 1. meter calibration. Gain test (0 - 199. The RF Oscillator and the RF Output tubes are usually metal 6L6 tubes but this particular 805-C was equipped with 1614 tubes instead. This HICKOK 6l6 calibration TUBE consists of a new that I have measured the mutual conductance and its value in GM 5, 100% as on professionally calibrated model 750 752 TESTERS. Typically the 6L6 is a metal tube, which are very good for this purpose. US Seller. It comes with the original operating manual. The calculator computes the loadline of of a single tube. This is fully operational with a 6L6 tube in the socket being tested. _____ Section II GRID BIAS CALIBRATION (This applies to all models "using 12AX7 DRIVER TUBE") A. Do you think the Big Muff clones would still work with this? Thanks! Mullard Magic stocks vintage radio, military radio like R1155, T1154, WS19, military spare parts, valves, tubes by GEC Brimar Mullard ECC83 KT66 ECC32 u52, radio components early wireless, vintage radio, domestic vintage radio, old technology of all kinds Hi, as I explained in a post in Loadline calculator for power stages, when you attach a load to n parallel tubes, each tube simply sees n-times the load. The 6L6 is a pentode that, according to Wikipedia, was introduced by the Radio Corporation of America (RCA) in July 1936. A 2E26 would have provided better 10 meter performance and been easy to neutralize. The VacuTrace comes with a set of adapter boards that allow testing of: pairs of 6L6-pinout tubes (covering most audio power tubes), octal and noval dual triodes (e. Tube testers which measure true Gm There is only 0. Leakage and bad isolation is an issue after 50 years. Which is what I measured. 1. Randall RD45 Diavlo Guitar Amplifier Head (45 Watts) Feb 13, 2018 - Preamp tubes NOS and like new - the best of the best! Run "known good" tubes in each spot at different signal levels and record results. But the transconductance on the tube is listed as 4010. The data is sorted in ASCII collating sequence character-by-character. To others it means that they produce matching test results on their tester. (Using a calibration tube to mark the micromhos ranges is Step 9 of the Hickok 6000 factory calibration instructions. The VHT Tube Tester 2 is an affordable bench and road tool that lets you see how your output tubes are performing in real time, and whether itʼs time for replacement or a bias adjustment, etc. 59. 3V or 5. 533a 539a Hickok 6l6 Calibration Tube. The following is a description of a few basic safe metering systems. The EVH® 5150III® 50S 6L6 Head is the perfect amp for players who want Ed Van Halen’s touring tone, arena volume and performance in a compact package. A copy of the calibration certificate and invoice for the calibration will be included with the tester. What is the correct tube to use in the AT-1 modifications? The 6BQ6 has less plate dissipation than the 6L6. Kinda cool. This tube is used to provide power for an AC synchronous motor which runs at 1800 RPM. Thank you and have a nice day Freddy The tube lineup is a single Eimac 4-65A tetrode modulated by four 6L6's in push-pull parallel. id on 2011-08-18, 21:04:08 (118. Comes with tube data and copy of manual. It will, however test the more common ham tubes like the 6146, 807, 6L6, and 811A. 9: B&K Dyna-Jet 707 tube tester calibration (10. com Tube in picture are just representative, not the actual tube you will receive. Tube not Tektronix 570 vacuum tube curve tracer, style 1. The transmitters are another FlexShopper has the latest in Receivers & Amplifiers, with the best lease-to-own options that fit your lifestyle. The use of Type 5881 tubes solved this problem and makes the amplifier very reliable. The gm of the My current amp is a Brunetti 35W Singleman 1x12 combo, and although the stock tubes were Tung-Sol power tubes, the Tung-Sol tubes wore out sooner than my experience with TAD tubes, and for that reason, among others, my choice has been TAD 6L6WGC power tubes for all my amps that are 6L6-based. So, our final calibration procedure consists of adjusting R1 to give a meter reading of about three quarters full scale with an average emission tube plugged into the 612. • Volume and Gain controls on each channel. check other equipment performance such as tube tester accuracy or for calibration purposes of tube specifications of a 6L6 tube data sheet. (12AX7 driver tube). He is wanting to check the Calibration of his Tube Testers. Seen on ebay cheap. It comes with some red and black cords, and a cord with a clip on it, see pictures. I've added a regulated heater supply that can be switched to 6. Find exclusive deals on brand names daily. Set the ENGLISH control to 73. I used an average emission 6L6 to calibrate my 612, as I was taught to do it that way, but I don't know of any particular reason why you should not use another tube type. Like an EL84 that acts like an EL84 and has the same output but has the harmonic structure of a 6L6 or a 12AX7 that sounds like an EL34 distorting in the front end, obviously alot of not so intended bad sounds may come of that but it means you could get most tube testers there is little calibration info is available for the few that do offer calibration data almost none address the heater filament voltage a quick way to determine if this might be the issue with yours is to set up your tube tester to test a 6l6 place the tube in one of those test sockets adaptors Some amplifiers can accommodate either 6L6 or EL34 tubes. Up for offer Sylvania JAN CHS 5933 vacuum tube black plate dual side getters. Cond. 01, September 2006. Something is fishy here because I otherwise believe at least the 6L6 is good. Almost all fenders transformers were 6. ive even tried looking for higher primary impedance transformers but companies like Hammond dont tend to make them. Not sure what they are used for. All testers will have some variations unless values are Spice Models for Vacuum Tubes (A Survey) Computer-aided design tools based on Spice Core, as Microsim PSpice, are used almost universally in the design of solid state circuits. 3V tube and the 12A_7 are 12. If you see some of these, definitely "glomp" onto them! The 12-volt equivalent of the 6146 is the 6883, the equivalent of the 6146A is the 6883A, and the 6146B is the 6883B. Every so often, after a few hundred hours of use, re-test the tubes. • Included EL34 tubes that can be replaced by 6L6's. Condition is Used. The pics show testing a 6L6, 12ax7 & KT88 also calibration using my self made module How to Use, Calibrate, Repair and Upgrade Vacuum Tube Testers. Older tube radios were all I could afford at the time. Calibration Tube The Metal 6L6 A huge number were made – lots to choose from Durable Inexpensive Many sources offer to sell you a calibration 6L6 Each one has its own construct of valid calibration 14 Here we have a working Hickok 533A Tube tester. Here is a point that is not in the manuals, but they probably never thought the testers would last so long. All current production 6L6 tubes are great tubes. The two tubes that this tester uses have been replaced For ECC83-type and 6L6/EL34 I've hard-wired sockets since these are the tubes I play around with most. Such a tester only ties the elements together and checks to see that the cathode can squirt out some reasonable amount of electrons these testers don't put 50 mils through a 6L6 and they typically only run the tube at about 250 plate volts. Regulation of the output of the generator is attained by causing the output current to control the grids of the 6L6's, as explained below. The amp’s transformers keep the heartbeat of the amp100% Italian and are custom made by Onori. The 6L6GC is a type of beam power tube employing a beam-confining electrode at cathode potential in place of an actual suppressor grid. Also had a couple bad tubes lying around for no reason whatsoever. Tube code 535 Tested with my calibrated TV-7 D/U tube tester. 30-day free The power is interrupted with a relay located in the plate circuit of a 6L6 vacuum tube that is controlled by a synchronous multivibrator. Overdriven – Analog-modeled overdrive pedal. Used calibration tubes 6L6 from Brent Jesee Recording & supply to compare both units. That concludes all of the calibration tests, next is post calibration tube testing demonstrations. What would interest me is flavours that are different to the type of tubes seeming they are emulating tubes with solid state components. R k: Cathode resistor. 99. The tester will test all popular audio tubes including 300B, 2A3, 12ax7, 12au7, 12at7, El34, 6L6, EL84, 5AR4, etc. This one-tube transmitter is made with a 6L6 pentode. This has to be true RMS voltage, not a calculated RMS from a typical averaging meter. (This warranty, however, does not include the TV-2’s own internal tubes, misuse or abuse such as testing a tube without testing for shorts firstand buyer is responsible for The % quality meter on this TV-2givescomparable results toa rebuilt and calibrated Triplett 3444 anda rebuilt and calibrated HICKOK KS-15750-L2. The regenerative IF No two models are alike, but common characteristics include 6L6 or EL34 tubes (associated with Fender and Marshall style sounds, respectively) and a large amount of tube distortion in the Overdrive channel. )" These hand selected NOS tubes can not only be used wherever the Hickok Reference 6L6 tube is called for in calibration procedures, but can also be used on ANY tube tester as a reference "new" 6L6 to check the accuracy of your tester. Notes on using the Calibrated 6L6, Hickok part no. The added fuse protects the high voltage transformer winding for the plate voltage against the remote possibility of a diode ever shorting in the solid state tube . The 150-watt Mclntosh amplifier, Model K-100 (Figure 25), again makes a sacrifice in other performance to obtain higher power, as Indicated by the data shown here (Figure 3). Complaint 4: Calibrated tube testers are generally not necessary. This is one of the most affordable tools to measure an amp's bias, and see how two tubes perform at the same time. Case shows some wear. Hickok put the two rectifier tubes on their sides for the space. I tried a couple of other 6L6 tubes, and one of them made it all the way to 120 in the test. Press P5, the gas 1 test button. A tube tester woefully out of calibration can still be used for matching tubes. EL84 Power Tube. Control “F” (model 10-40) selects proper supply voltages for Gas Test or VR test. Chey in Thailand. Viola! A "tube tester" which lets you find matched triodes (if you care), match output tubes under real world conditions (if you care), test for microphonics (combo cab of course), and find out how the tubes sound. 68) Kit No. So, I naturally look to online sources such as eBay for affordable sets. Some players prefer the extra clarity and punch of the 6L6 tube types. Press P5, the GAS 1 test button. Plug-in coils had to be wound as part of the kit construction with plans for coil sets covering 160M, 80M, 40M and 20M. That was the russian 7025 but only 1 out of 3! Then I tested the Gold Lion ECC83 tube. Small chip in the base. I can provide additional pictures or info on request. If you have an amplifier that can use either 6L6 or EL34 tubes, you will quickly notice that 6L6 tubes are more "Fender", where EL34 tubes are more "Marshall". All 6L6 tubes suck; Thoughts? Opinions? Please discuss. Push P4 and observe the mutual conductance reading. Peavey 5150 Tube Set, JJ Tubes (x4 6L6GC, x5 12AX7 One 6L6 that has been marked with its µmhos (umhos or micromhos) values to be used in calibrating tube testers that have a µmhos readout on their dial. Thanks to the Memory Backup function, the Calibration and reference pitch are remembered even when the power is turned off. 6. Hum and glowing tubes! David Gereg : 12 : 1 : 10-14-11 07:34 pm: Mm112/rd 65watts: Steve kennedy: 7 : 1 : 08-03-02 12:55 pm: Power on light on HD130 : Anonymous: 4 : 1 : 03-06-06 08:30 pm: Hot front end? Michael Kaus: 1 : 1 : 08-05-02 08:08 pm: HD 150 Bias and tube selection question: Terry: 5 : 1 : 08-28-02 10:34 am: Smoking Tubes on HD 130 5. The final calibration control is in the filament circuit of the 5Y3 The tubes that readers ask about most often are the EL84, EL34 and 6L6. Price is for a Single Tube 12ax7 Tubes Tester Hickok Calibration Tube Variant 6ax7 6l6 Tv-7 (50. This TV-7B is available at $350. Various brands. This is our newly designed audio tube tester, eqipped with the following powerful testing capabilities in a compact unit . Unlike the EL34 power tube, 6L6 tubes generally sound a little cleaner and tend to have a bit more beef in the low end as well as more bite on the top. 188-20 Getter 4400 Ge Gm Tube 533a Hickok Black 6l6 Plate Gc 59-17 Dd Test (31. 1, 1957, 2 pages: 10/1/1957: 3200-42: Download: 539A: Foreign Tube Test Data : Download: 539B, 539C: Tube Test Data, 83 pages : Download: 539B, 539C: Foreign Tube Test Data - Supplement to Roll Chart 3200-197: 1968 : Download: 539B: Foreign Tube Test Data This document consolidates all Hickok 533A-600A-605A tube data that I have seen. Fabe CBS, Newfoundland, CA ***@yahoo. ca It is much better to use a tube tester than your amp or preamp to test tubes. [ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ] we see a properly biased 6L6 tube would only require 10-20 volts of open key voltage to cut off the transmitter. All voltages are calibrated to factory specs. But with a tube in the socket the filament voltage drops under 6 volts and you get low Gm test readings. Measured with an accurate DMM loaded properly to match the conditions spec'd in the military manual. Release P2. The open key voltage of 75 volts further increases if the oscillator is impressive results on a tetrode (EL84/6BQ5) or a beam power tube (6L6). for making these sets. Tubes are tested for shorts and gas. Some amplifiers can accommodate either 6L6 or EL34 tubes. This is fully operational with a 6L6 tube in the socket being tested. By then a three tube superhet (converter + regen detector + audio amp) is shown as minimum receiver for the novice. And they are just as simple to build. Put these tubes _away_ in a safe place. Adjust the BIAS control for a reading of 100 on the 3000 scale. For someone wanting to start a tube selling business this would be a great test unit to have restored, you could absolutely start a professional caliber tube selling business with this tester but you have to invest the money to do it right this unit needs a full restoration and calibration by someone who knows what they are doing. These manuals are available for download and free of charge. This applies to all models "not using 12AX7 driver tube". Primer and painted exterior for a more presentable look. Double check the mains calibration mark now, with a 6L6 tube. When connected to the socket on the test tube. These amplifiers most often have a switch to change the bias range between these tubes. Put the tube in the tester and set it up for the standard 6L6 test. Tester box has wear on it see pictures. All voltages are calibrated to factory specs. The head has 6 voice channels and 6 valve responses (EL84, 6V6, EL34, KT66, 6L6, KT88). I choose the 6L6 and the 12AX7, since these tubes were AFAIR reputedly being used for Hickock calibration checking and setting. I have a Blackstar ID60TVP-H 60W head running into a Blackstar 212 cab. I put in my calibration tubes, all good. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive. This retro-modern masterpiece updates the mid 60’s classic with an all-tube feature set designed to deliver superior sonic flexibility and ample headroom along with enough stage volume to handle any gig. Full-Tube Amp Head for Electric Guitar 3 Channels, Power output: 50 W, Tube equipment: 2x 6L6 and 7x JJ ECC83S (12AX7), Channels 1 and 2: Separate volume and gain controls via dual concentric potentiometers, common low, mid and high controls, 6l6 Calibration . There are both metal and glass envelope styles available in NOS tubes, although current production tubes are glass only. So I seem to be in good shape. When I replaced the 83 in my 539B, I used my calibration tubes (6L6 & 12AX7 & 80), I had taken readings with a good 83. and several designs were presented using various dual triode tubes. Other tub . The 83 tube was replaced with SS (2) diodes and (2) resistors according to Alan Douglas in his book on tube testers, most people do not recommend replacing the 5Y3 with SS diodes. Any questions just ask. The 1614 tubes are 20W plate dissipation, heavy-duty industrial versions of the 6L6 metal tube. Some sort of radio calibration thing. net. Will be well protected for shipping. www. What you get is the selectivity, calibration and slow tuning rate of the BC-453 on those bands. 2. The 6l6 tube datasheet states a transconductance of 4700. Do not be tricked into paying for a manual that is available here for free. Seven 12AX7 preamp tubes shape the tone of the amp’s three channels as well as the tube-buffered effects loop. FREE Shipping. 47: RE: Hickok 539c problem (6. Standard Reference Tubes (Golden or Bogey) A 6L6 standard tube. 136. Seven 12AX7 preamp tubes shape the tone of the amp’s three channels as well as the tube-buffered effects loop. With the drop-in replacement, the readings were within a couple of needle-widths. 0 volts. It will test 5AR4, 5U4, 5Z3, 6L6, 6V6, 6SN7, 6SL7, 6CA4, 6CA7/EL34, 6DJ8, 6922, 5751, 5881, 12AT7, 12AU7 and 12AX7 along with many other audio and radio tubes. Perfect for effects, this amp can make any guitar sound great. The 6L6 is a rather extended family of beam power pentode tubes, with an octal base. The basis for this amp started out as a post in a thread on the DIY Audio Projects Forum site. We tested the following tubes consistently with our calibrated, shop B&K 747B tester (12AU7, 12AT7, 12AX7, 6L6, 6V6, 6BQ5 / EL84 & 6W4). I Googled for calibration instructions and found one for the 800. Plan on Find many great new & used options and get the best deals for Apollo Pilot A26 990 Replacement OEM Beeper Pager Holster at the best online prices at , Free shipping for many products, Featured products Free Shipping Worldwide Top Selling Products Hot-selling products Get your own style now! Up to 80%. Set the switches per the chart, 6L6GT; I set the English R7 Bias pot to the chart for 6L6. Obtain a 6L6 tube that is known to be free of gas. Apparently, it was used quite a bit in public address systems. This tube has been calibrated using a known good laboratory grade tube tester serviced and calibrated by a professional. Ditto for the first post-graduation from college set-up (I'd sold the FT-101B, to scrape up money for a 2m all mode radio, so I needed something [preferrably with 160m capability] for HF) - a set of Drake Twins (R4B & T4XC), due to a lack of money. • 2 channels: 1959 Plexi type and 800 Boost type. Measured with an accurate DMM loaded properly to match the conditions spec'd in the military manual. This is one of the most affordable tools to measure an amp's bias, and see how two tubes perform at the same time. One initial test says to check plate voltage which should be TV-7B Tube Tester. Comes with 2-7pin miniature sockets, 2-9 pin miniature sockets, 2-loctal, and 2 octal sockets for testing. 6V heaters. _____ 6L6 Vacuum Tubes at Europe's largest retailer of musical instruments - fast delivery, 30-Day Money-Back Guarantee and 3-year Thomann warranty Served with love! Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. tubes that don't test as strong do seem to correlate with not working in this test. THESE will become your indicator/test tubes. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. Gassy / Grid leak tube testing capability. Three amp channels to choose from (Clean, Rhythm, or Lead). The EL84 tube has a snarly sound (bright with midrange punch), and is usually found in smaller wattage amplifiers. These tubes "show up" at hamfests, swap meets, etc. For output power tube biasing, cathode bias is the last thing I want to choose sonically. "GASSY" LED lit up indicate a leak of grid. FOR SALE! This particular lot is for a known value NOS 6L6 tube to 192183903690 I am amazed how good 10 watts of tube amplification sounds. To some it means the tubes are identical in brand, part number (6L6, etc) and appearance. The numbers you see will be from 25-55mA or so. 12% loss from the reference voltage and that is removed with the Gp calibration. * Receipt showing calibration by the best TV-7 calibration guy on the planet * Will test all major audio tubes, including but not limited to: 6DJ8, 6922, 12AX7, 12AT7, 12AU7, EL34, 6L6, KT88, 6550, 2A3, 300B, and thousands more ! * Include test data setting booklet / owner's manual * Rated 7/10 due to cosmetic flaws only. 7. Tests perfectly with 6l6, 12by7, 6au6 and other tubes, see photo. 6L6 Russian is complimentary, this tube is to replicate the 6L6 RCA. Calibration. The amp’s transformers keep the heartbeat of the amp100% Italian and are custom made by Onori. Then adjust line adjust calibration pot (or change the resistor value) so that the meter is set to the set line voltage mark. The pics show testing a 6L6, 12ax7 & KT88 also calibration using my self made module ( only available here with instructions ) & shorts light working . I would expect them to test around 5000 as the chart shows. A 12-watt 6V6 power amp with some negative feedback and a pentode input stage. 6l6 calibration tube