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SWR SM-900 - no signal at preamp. Anyone got a schematic?

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  • SWR SM-900 - no signal at preamp. Anyone got a schematic?

    Got an SWR SM-900 from a buddy, he plugged the output of a power amp into the effects loop and blew up the frontend. I replaced all the op-amps and I don't get any signal, but when I crank the gain I can hear a hum (nothing out of the ordinary), and all the EQ and shaping options work properly. Any suggestions, or does anyone have a schematic for this thing?
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