01-14-2016, 10:28 AM
just realized you addressed the preamp tubes being cold in your post, sorry about that.
If a few preamp tubes are not heating up, there could be problems with the DC filament supply. as I recall ampeg has DC filaments on a couple of the preamp tubes. that would seem unrelated to the switching of the power level though.
If a few preamp tubes are not heating up, there could be problems with the DC filament supply. as I recall ampeg has DC filaments on a couple of the preamp tubes. that would seem unrelated to the switching of the power level though.