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In Reply to: RE: Question on a tube receiver warmup posted by onemug on April 11, 2014 at 09:05:40
You most likely have a weaker tube in the MPX that corrects itself as it stays on..Do this..When you put it in mono,do you still get the warble on startup? If so,we can safely assume it's in the mpx and the 6BL8 and the 12AT7 in the rear are the most common failures on those.Your alignment may be slightly off if you have to change tubes but not always.
Honest amplification is better than excessive 2nd order distortion anytime.
Edits: 04/11/14Follow Ups:
No warble in "mono" when I first turn these on. Go to Stereo a minute later and there is warble but goes away in less than 5 minutes. I will pull and test those tubes you mentioned.
I will clean the tube pins and sockets anyway, wonder if that has a chance for the fix?
Let me tell you tho,it could still be alignment issues slightly off and the tester may show the tubes as good on emission but may have slight leakage that cures itself after warmup..See if the test higher after being in the tester for six minutes.
Honest amplification is better than excessive 2nd order distortion anytime.
Edits: 04/13/14
I'll try that this evening.
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