Quote:   Hi fenom60, I've looked at interference from other devices. I have even had the amp in a room on a wooden table, with no other equipment present other than the headphones and power lead, but the hum was still there :(    This probably doesn't help, but, as soon as I switch...

Firstly, left me apologize for a lengthy first post.   I have a question about a mains hum on a WA22. I'm new to WA22 ownership and this is my first valve amp so I'm not sure what to expect. For all I know all amps might be the same. I'm not the first owner of this amp and it's just over a...