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RE: ... also a reminder bias is set with no signal. It goes up and down once signal applied. (nt)

Your previous explanation was great. thanks!
As far as input signal changing the bias, before I bought the Cary I had a pair of ARCs & they just had me spooked. For example, it wasn't uncommon for a grid resistor to go "POP!" shortly after I hit the power switch. I used to cross my fingers whenever I turned them on. & yes, I did notice that turning on the preamp made the bias do crazy things.

I didn't see that in the Cary. It never seemed to matter what I did with the preamp, the bias always stayed put.

"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"

Edits: 07/28/20 07/28/20

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