Orange Amps Forum

Hello everyone,

My ‘09 rockerverb 50mki has developed a noticeable 60 hertz hum when the amp is on. Also turning up the reverb dramatically increase the hum and noise. It’s not a 120 Hz hum. Definitely a lower pitch hum. I have the amp on an isolation transformer and I have replaced all the tubes and reseated the plugs to the reverb tank. The hum happens with nothing plugged in and all the knobs at 0 as soon as I turn it from standby to on. The amp is completely silent when it’s in standby. I have attempted to plug in to the effects loop in but that did not resolve the issue either. I have even tried unplugging the reverb tank and that did not help either.

Any advice would be greatly appreciated.

You hear it even with nothing plugged into the input? That's not right. If you've already replaced all the tubes, I think it's time to take it to a tech. I know that's not what you want to hear, but it sounds like a deeper issue (maybe something coming ungrounded or some sort of short?).

Hum like that could be a failing filter cap, possibly one of the output tubes on the way out (ie mismatch), to find out you really need a signal generator/scope to find out where the noise is coming from in a logical manner.