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Manley Steelhead making a "thunk" sound

I have a Manley Steelhead with the stock tubes. It is making a soft "thunk" sound every few seconds. I don't notice it when playing music, but when it is just "idling" I can hear it. It's not very loud, but definitely noticeable. It comes from only one channel, comes through the speaker and does not seem to vary in volume as the volume control on the Manley is increased

Any ideas before I contact Manley?

rlindsa


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Topic - Manley Steelhead making a "thunk" sound - rlindsa 18:01:34 02/02/16 (1)

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