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What does unmatched tubes leads to

post #1 of 5
9/27/03 at 12:28pm
Thread Starter 
can something happen, soundwize, else then R/L imbalance?
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post #2 of 5
9/27/03 at 1:38pm
You might not even hear left-right imbalance. Matching small signal tubes is highly overrated, IMO (even though I try to do it). The amp circuit is going to compensate for mismatching to some degree, so unless you've got a situation where one triode is new and the other is dying, it's not going to matter much. I've tried some "mismatched" tube sets (sometimes on purpose ), and have not really noticed a difference. All of the 12A?? types, 6DJ8 types, 6SN7 types, etc are small signal tubes.

It's a different story with power tubes, particularly in a push-pull circuit. There, mismatched tubes can create an instability in the circuit, and can damage the tubes and amplifier.
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post #3 of 5
9/28/03 at 1:43pm
It can cause impotence.
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post #4 of 5
9/28/03 at 4:31pm
Quote:
Originally posted by Hirsch
You might not even hear left-right imbalance. Matching small signal tubes is highly overrated, IMO (even though I try to do it). The amp circuit is going to compensate for mismatching to some degree, so unless you've got a situation where one triode is new and the other is dying, it's not going to matter much. I've tried some "mismatched" tube sets (sometimes on purpose ), and have not really noticed a difference. All of the 12A?? types, 6DJ8 types, 6SN7 types, etc are small signal tubes.

It's a different story with power tubes, particularly in a push-pull circuit. There, mismatched tubes can create an instability in the circuit, and can damage the tubes and amplifier.
You sure about that? I know the Manley Stingray, in particular, advertises that tube-matching on the power tubes is not that important, because you bias them individually. I would have thought that it was more the other way around -- I.E. that it would be more important to match the driver and input tubes.

I wouldn't put them (unmatched power tubes) too far off, though. If the circuit is of the self-biasing variety, and it doesn't do them individually, it could get "confused".

Wouldn't mind someone else with more familiarity with tube amps piping in (Tuberoller?).
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post #5 of 5
9/28/03 at 5:21pm
Quote:
Originally posted by Dusty Chalk
You sure about that?

The next time you come over, I'll put a tube that has a 20% differential or so between the triodes as the gain tube in the Supra. All you've got to do is to tell me which channel has the weaker triode...
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