Thanks for the tip and tutorial! This helped me quickly identify a microphonic tube at my (cramped) pratice place, without having to bring the amp to a tech.
did replacing them take care of the volume drop? because microphonics and volume drop dont seem to be the same issue
that was the reverb driver so it would affect the tank
Um, VOLTMETER... JJs and Groove tubes? Ugh!
Let me get the popcorn going… this was entertaining… omg