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- with power tubes removed it is totally quiet. :wink:

:arrow: jvk & boogiebabies The most important reason of popping in RK and Roadster is switching elements being on high potential. It take place (for example) especially at first gain stage where anode resistors (220k & 100k with adequate capacitors 22nF & 47nF) are subsequently switched to anode...

What about current per tube when Vacuum Rectifier and Spongy Mode are engaged together? Is 7-9 mA per tube still enough or not? The same with RK, especially with EL34's ;)

- if you'll do so, there should not be pops from rectifier switching only. The same when you set one kind of power tubes for all four channels - no pops from power tubes switching only.

Pops has very different causes and comes from different places: unproper function of muting/clamping circuit; in preamp - making switching capacitors by relays to circuit points being on high potential, especially when switching from clean channels to distorted channels in both directions (it...