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Ashdown LB30 head - white noise


basskit_case
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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

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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.

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