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In Reply to: RE: Tube question posted by Lee of Omaha on May 09, 2015 at 16:39:42
Needing more current to produce a set amount of watts, at idle. Eventually, with use this weaker tube make not be able to be adjusted to that set wattage. At that time, you should buy a closer matched set of output tubes.
Follow Ups:
How many hours do you think you have put on the set of all of the EL-34s you are using. It may make sense to re-tube at this point, to avoid the fireworks some tubes make on their way out.
Steve
Hi and thank you for replying to my post. I have just over 2000 hours on the tubes. I am sensing a little loss in dynamics but it remains clear in the mids and highs.
Best,
t.
Yup, the tube is probably getting weak. Your biasing scheme sets quiescent current. There should be an AC balance control to adjust for transconductance mismatch, as well. If there isn't you should use tubes that match for transconductance.
One of the first signs of output tube(s) getting weak.
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