I notice that most people using tube dampers do so on the small input and driver tubes of their amps, but tend not to do so with the thier output tubes -- why would that be?
Perhaps because power tubes tend not to suffer from microphonic's. At least I've never heard one that did and I've never noticed a difference when I tried any tube ventilation/dampening devices of any type on power tubes. Pearls look cool though.
The small tubes are a) more microphonic and b) usually used for signal splitting and amplification. The goal is to add a minimum of noise before the power tube/output stage.
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