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Ashdown ABM500 amp head farting at loudish volumes. Any help?


coffee_king
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Hey guys
Ive got one of the early Ashdown ABM500 heads which Ive been using for years. But its suddenly started to make weird farty noises in my cab when I crank it up past about 6/10 on specific notes. Its definitely not the cab as Ive tried it on different cabs and tried different heads too.
Any suggestions?
Thanks in advance.

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Are you using the valve drive? A dying pre-valve could cause symptoms like that. When you say you are cranking it past 6/10, you mean the output knob I assume? If so then I would have thought a dying valve would be heard at all volumes - but it could be just that it isn't noticed until higher output volumes. Do you get the same problem when the valve is switched out?

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