Hello There,
A few months ago I purchased a 2/90/2 brand new from GC and the tubes / fuse on one of the channels failed almost immediately which you took care of by sending me the replacement parts. A few days ago, I noticed that the standby button on channel one now produces a crackle when turning on or off. The crackles starts occurring after the tubes are fully warm (Perhaps after about 5 min of playing) and it doesn’t go away. Just to clarify, the crackle occurs only when I use the standby switch to go on or off, nothing otherwise.