Ashdown ABM 300 C-110 hum
This is my first post on this forum so I hope you'll all forgive any transgressions.
I'm pretty new to playing bass and have just bought a second hand Ashdown ABM 300 C-110 off eBay. The first thing I noticed when I plugged it in was that there was a lot of hum. The tone controls can reduce or increase the hum. The hum didn't change when I plugged in the bass.
Then I noticed that the VU meter didn't so much as twitch when I played the bass. It's an active bass with a new battery plugged into the low socket (though I tried both).
Sweeping the Input Mix doesn't noticably change the output which is nowhere near as load as I'd expect.
I've removed the head and reseated the valve. There is the barest of glows from the valve.
Anybody any ideas what might be the problem? I suspect the valve myself.