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I purchased a matched set for my '81 Princeton Reverb. Checking the Bias and PV with my Bias Probe and VOM. I discovered they were not matched or even close to the same current draw lower one was about 14.3 mA and the higher one was 19.7 mA at 431 PV. Okay I figured close enough but not really matched. After only a few hours of moderate use the 19.7 mA prematurely failed. I know this happens with any tube brand, had worse troubles with Sovtek 6V6's several years ago and have been using some used RCA OS tubes (not well matched) from a re-tubed amp I used to own. I have a set of JJ's in my Deluxe Reverb that seem to hold up well and have given me no problems. I'll replace the failed tube with a new JJ and hope they hold up as a pair.
