CALIBRATION TUBES FOR HICKOK TUBE TESTERS - NO RESERVE

This lot is for a known value 6L6 family tube and 12AX7 tube used in the calibration process for a Hickok 600, 600A, 6000, 6000A, 533, 533A, 800, 800A, 534, or 605 tube tester. 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 tubes are generally foreign tubes that are NOS or were pulls from new equipment---they are chosen for their ability to provide a stable Gm reading rather than for music quality, and the pictures are generic---your tubes may differ in appearance. The 6L6 tube is tested against a known calibrated tube on a calibrated 533 Hickok. The value of the 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 the 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 6000A Hickok. All sets of instructions 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 12AX7 tube to check this, as well---if the 6L6 and the 12AX7 give significantly different readings from the known tubes after you have set the Gm ranges and followed the calibration procedures, your bias potentiometer may be at best dirty or at worst worn or faulty (as in perhaps more than 50% of Hickok testers).

I sell primarily used electronic items, antiques, or collectibles. There may be use marks or other flaws that have to do with age and use that one can reasonably expect---any major flaws that I detect will be descibed. All items are sold AS/IS. Since most items I sell are vintage, I cannot be responsible because of their age or their misuse---I remain, and am, responsible, however, for an accurate description. To qualify for a return, I must have made a mistake in the description which substantially alters the agreement, and the item must be returned unused and in the condition in which it was sent. I do not sell on speculation or on approval; what you see and I describe is what you get---please read the description and the terms therein carefully. Any questions regarding the item should be asked before bidding. As a seller, I provide feedback after the buyer leaves feedback so that I know everything is complete. Iif there is an issue with your item, please contact me prior to leaving feedback so that we can address it. Lost or damaged items will be refunded, less shipping, when the insurance claim is paid. International bidders, if allowed, are responsible for all customs fees, and American law requires that I declare the correct value on the customs forms.

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