Quote:
Originally Posted by bradpdx
Auggghhh!
I would not discount the psychological effect - I think that is really the majority cause. It just "seems right" that the amp should sound better when it is "warmed up", but in my own experience of many years on stage I have just not found this to be true. My old tube amps sound good within the first minute and stay there all night long. And that is how it should work.
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Typically I wouldn't discount it either, but it's definitely not my imagination. To me it does not "seem right" that once heated enough to pass electrons, the tubes should behave any differently as the amp warms up
more, but your suggestion that the resistors behave differently is as close to a good explanation as I've heard.
My other tube amps do not do this, only the SFDR. My DRRI (recently sold) and Boogie Mark IV behave the same after 60 minutes as they did after 60 seconds. Ditto with both of my Twins, although they don't get much stage use so it's possible that my SFTR may be the same way.