![]() The tech that repaired my 752A says that the lower reading is normal, and that Hickoks in general test these tube low (he said a new 12AX7 generally tests at 1250 on a 539C). According to the roll chart, minimum for a 12AX7 is a meter reading of 200 (Gm 800 at meterX4), meaning that nominal new should be 1600 (752A minimums are 50% of new spec).Įverything seems to make perfect sense except for the actual test result. ![]() For example, a 12AX7 that tests around 100% on a couple of other Gm testers I have tests at only about 1100 on the 752A. The tester seems to be particularly tough on the 12A_7 series. It does a great job on the power tubes, but I am having some issues on small signal tubes. I just got my Hickok 752A back from repair and calibration. conditions and expected results appear in tube manuals published by tube. We build new meters for Hickok Tube Testers & TV-7 Tube Testers Flat Rate Shipping for Tube Testers and New Meters Tube Tester Repair, Calibration, & Customization TUBE TESTERS AVAILABLE We have several tube testers available for sale, but not listed yet Hickok 539B (late model), Hickok 800, 600, 6000 & 6000a, 533A, 799, Sencore TC28, and more. ![]() Posted by baileyler (A) on Augat 16:38:42 If you can do a line adjust and test tubes, then the 83 and 5Y3 rectifiers in the tube tester should be good. Testing of vacuum tubes and conditions used by Hickok-designed testers. Do Hickok Tube Testers Read Certain Tubes Low (Like 12AX7)?
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