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My understanding after a bit of more research (which might be wrong but someone more knowledgeable could answer that) is that because of the fixed-bias design, the bias circuit restricts the current to a safe and controlled range (20-40mA for Mesa Rectifier Amps) because of the amp’s circuit...

Hello everyone, I've done some searching on the internet and couldn't find any respectable official source to answer my question, so I'm writing here in the hope that someone can shed some light on it. I know that Mesa Rectifiers do not have a bias adjustment switch, so the replacement tubes...