Ashdown LB30 head - white noise

[basskit_case]

When I fire up my LB30 with all EQ channels enabled, switch in up position, the head emits a white noise/ interference noise.  If I disable the bass channel, switch down, the noise is greatly reduced.

 

have added a video to try and illustrate the fault.

 

is this typically a valve issue or could it more likely be something else?

thanks

[Chienmortbb]

I will probably get hammered for this, but in general, Valve MI amps are noisier than solid state.

It also looks like you have the MID SHIFT and BRIGHT engaged. BRIGHT often adds white noise to a sound.

[basskit_case]

Thanks for the reply, this is my second one of bought to replace one I had when the LB30's were first released, this one is a lot noisier than the previous one.  Although as you say there is always some noise with valves

 

I have tried all the combinations of settings and the only thing that reduces the noise is to disengage the bass channel.