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> Known value tubes for calibration, some hickok testers
Known value tubes for calibration, some hickok testers
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 OR 533A tube tester. These tubes can also be used to gauge the the measured value of another brand tester as a comparison with what a Hickok reads, but I have no other brand calibration information except for B & K Gm testers (550, 650, 707). The 6L6 tube is tested against a known calibrated tube on a calibrated 600A Hickok. The value of the tube is used to set up the appropriate Gm range (3000, 6000, and 15000). 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, or for calibrating a 533 or 533A Hickok as outlined in a 6/14/61 Hickok company bulletin on calibration. I will provide the site for download for a 6000 or 6000A Hickok. All sets of instructions call for use of a known value 6L6 tube. Note that the picture is for reference only, as the actual tubes may differ in appearance. 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 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).
