CaptnBob Posted January 4, 2012 Share Posted January 4, 2012 I'm testing some 12AU7 tubes on the faithful Hickox 533. Most are checking about where they should, but the two Chinese tubes I got today are testing way strong - one pegs the meter on both tests, the other comes close. Is this a case of "They do that," or am I risking smoked McIntosh by using them? Quote Link to comment Share on other sites More sharing options...
Guest " " Posted January 4, 2012 Share Posted January 4, 2012 they are probally not 12au7's, by the ound of your redings, they probally are 12ax7's. test them again as 12ax7/s and see if they score correctly. using a 12au7, or 12aT7 inplace of a 12a7 is ok, but using a 12ax7 in place of a 12at7 or 12au7 will cause distortion. Quote Link to comment Share on other sites More sharing options...
CaptnBob Posted January 4, 2012 Author Share Posted January 4, 2012 Hmm. They are labeled 12au7 and boxed as 12au7. I tried testing them as 12ax7s, but they didn't look happy, so I ended the test prematurely. I'll try again tomorrow. Quote Link to comment Share on other sites More sharing options...
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