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What problem causes my Tube Pre V2 to generate a pulsing thump beat and not pass a signal?

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asked Mar 18 in PreAmps, Signal Processors and Monitoring Hardware by rogercordes (120 points)
This is a used unit. Using guitar to instrument input with instrument button engaged, and XLR output to board. None of that matters. No instrument, different mixer channel, *all* equipment off except the Tube Pre and the mixer, no change. Just a thumping noise. Thanks in advance for any knowledge or suggestions.

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