Back in the late 60's I converted a old jukebox amp to use for a bass amp.
It had a circuit that when turned on 110 volts were applied to the filaments, as soon as there was current in the power amp cathode circuit (relay coil in series) it dropped the filament voltage to normal. It was almost instant on.
So, it really doesn't matter how long the warmup is.
I no longer have a tube anything.
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"My opinion is worth every penny you paid for it."
"If you try to play like someone else, Who will play like you". Quote from Johnny Gimble
The only musician I have to impress today is the musician I was yesterday.
No tubes, No capos, No Problems.
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