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Well, this is an update to my previous post. I've noticed that the problem only happens in Class AB mode, 25W. I think it can be a BIAS problem. I have two sets of Mesa Boggie el84 tubes. The one I bought new to put in the TA-15 causes this problem in 25w mode, but if I put them in a Mini...

I have a Ta-15 with this problem, the volume drops after some time playing. It happens on the two channels. If I put it in standby mode and turn it on again the problem goes away, but if I continue playing, the problem happens again. I've changed all the preamp and power tubes, but the problem...