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RE: Fed up with old stock 12AX7 RCAs dying or becoming microphonic!

The tubes had measurements and also I have a tube tester here (Stark 9-66) so I was confident that these were cool. The tech went over the MX110 where most of these failures had occurred and the other can be taken to a tech but nothing working out of spec to my knowledge. The 110 had a power supply cap leak at one point so I figure that taxed the tubes somewhat. But I wassn't stupid. I soon turned the thing off and then took it in!

I suppose this could be a two part thread however....basically I am wondering if one could get away with new production input tubes such as the 12AX7 (note - no other input tubes have been affected in this way in both units) and my answer from two people was Mullard 12AX7 reissue and the JJ ECC803s as recommendations.

This is gonna be interesting as I went all RCA long black and grey plates for a while and although they are warm, they also have a degree of brightness on top that I can still hear...


Paul


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Follow Ups
  • RE: Fed up with old stock 12AX7 RCAs dying or becoming microphonic! - Paul Kehayas 12/21/1606:13:10 12/21/16 (0)

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