Hickok Tube Tester Calibration Tubes, 6l6 And 12ax7 Variant (6ax7)

US $34.99

New Braunfels, Texas, United States
Jan 29th

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This lot is for known value 6L6 and 12AX7 variant (6AX7) NOS tubes used in the calibration process for a Hickok 533, 533A, 534, 600, 600A, 605, 800, 800A, 6000, 6000A, or TV-7 military Hickok or Hickok-based tube tester. PLEASE SEE MY FEEDBACK FOR THESE TUBES. These tubes can also be used to gauge the measured value of another brand tester as a comparison with what a regular Hickok reads, but I have no other brand calibration information. These NOS tubes are chosen for their ability to provide a stable Gm reading rather than for music quality. These tubes are tested against known calibrated tubes on a calibrated 533 Hickok. The value of the 6L6 tube is used to set up or calibrate the appropriate Gm range (3000, 6000, and 15000) on Hickok testers. I will email the winner with scans of instructions for calibrating a 600 or 600A Hickok (as outlined in a 12/2/55 Hickok company bulletin on calibration), calibrating a 533 or 533A Hickok (as outlined in a 6/14/61 Hickok company bulletin on calibration), and the calibration instructions for a 6000 or 6005 Hickok (as outlined in a 2/25/60 Hickok company bulletin on calibration). Instructions for calibrating other models in the testers listed above can be viewed on the internet , but I don't offer them because I am not sure if they are copyrighted --- Google or Bing for what you want to make sure you get what you need. All sets of instructions of which I am aware call for use of a known value 6L6 tube. Since I have found that the bias pot can be off significantly, I am also including a known value 6AX7 (same characteristics, settings and test values as a 12AX7, but on a 6 volt heater setting rather than a 12 volt volt heater setting) tube to check this, as well. If the 6AX7 tube gives significantly different readings from the known values after you have set the Gm ranges and followed the calibration procedures with the 6L6, your bias potentiometer may be dirty or worn (as in perhaps more than 50% of Hickok testers). IMPORTANT --- The reject points on these testers is 750 to 790 for a 6AX7 and 3150 for a 6L6 (32 for 6AX7 and 25 for 6l6 on a TV-7 tyoe tester). The nominal NOS Gm is 1250 for a 6AX7 and 5000 for a 6L6 (50 for 6AX7 and 40 for a 6L6 on a TV-7 type tester). On a TV-7 type tester, each point is equal to 25 Gm points for a 6AX7 and 125 Gm points for a 6L6. Look on the internet for a Stark tube chart (bama/edebris has one)---this is essentially a Hickok tester made in Canada, but they took the time and trouble to clearly state your reject and nominal NOS points. Each of these testers listed above was designed and the test settings and parameters specifically created to read a 12AX7 tube and a 6L6 tube as I have outlined above---even if some of the settings differ, the readings should be the same. Please read the description, look at the picture(s), and read the shipping, payment, and return policies. I request payment within three days of auction end. As a seller, I provide feedback after the buyer leaves feedback so that I know everything is complete. If there is an issue with your item, please contact me as soon as possible so that we can address it. International bidders are responsible for all customs fees, and American law requires that I declare the correct value on the customs forms. Other countries not listed, please contact me for cost, conditions, and availability. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.