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Accurate Instruments Model 257 Tube Tester
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03-28-2015, 10:28 PM
jr_tech
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Join Date: Sep 2009
Posts: 4,523
Most testers that I have seen have a pot for calibration in the meter circuit (either in series or as a shunt). My first guess is if the tester is reading too high or too low on known tubes, then it should be re-calibrated.
jr
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