73 dual showman reverb dead stock just arrived. Upon further inspection, i've found that when switching on the standby switch, then power switch, then shutting off the standby switch, the amp powers down. no sound. tubes go dark. Amp only works when that standby is on. Does anyone know what that could be? and any potential harm that is being caused? like cooking tubes or anything like that? Contacted previous owner, and he said he always used it like that. Every fender i've ever had did not have a standby switch that required always being on to operate.
-Vic
-Vic