Ashdown ABM owners club

[dagrev]

I was able to use a car trim removal tool to carefully get the plugs out. Changed valves and that was not is source. 

[dagrev]

Clip of the bizz. Will have to turn it up a little. It's more quite in the clip than live. 

 

[BassAdder60]

Have you tried it in a different electrical socket ? 
Mains hum perhaps ? 
Presumably it makes that noise with no input ? 

Edited 3 hours ago by BassAdder60

[dagrev]

Yes, same noise.

But no noise if nothing connected in the input. 

Does get louder if output is raised. Never goes away even is output is all the way off.

Edited 2 hours ago by dagrev

[DGBass]

The easiest way to prove if you have a noisy tube is to make sure the valve drive plus button is switched off ie all the way out. Plug your bass in and you will be bypassing the tube fuction without the valve drive button out. If you still hear a buzz/hum then its not the tube that's causing it. FYI, ABM's like the EVO IV will be quiet with no instrument plugged. The input jack has a switched signal contact to ground with nothing plugged in. In general most ABM's should be quiet at idle with an instrument connected, and not buzz or hum if they are in good condition. If you have only just bought the amp, and the noise persists and it doesnt appear to be the tube, might be worth returning it or taking a chance and asking a Tech to look at it for you. It could be something simple, like a loose ground screw or ribbon cable plug if its been jiggled about in a courier truck at some point in time. But then again it might be something else that is causing the noises. My own EVO IV is dead silent at idle with a bass plugged in and any ABM I've owned in the past has always been quiet at idle with a bass connected.

Edited 30 minutes ago by DGBass