MARSHALL 9200

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Pull the power tubes and check voltages at each power tube socket. Important to have B+ voltage at BOTH plate and screen pins at each one. Also verify bias voltage at control grid pin. I am too lazy to look it up, so I forget if there are cathode fuses in that model, but verify the cathodes are grounded at each socket.

Failed power tubes often take out a screen resistor when they fail.
 
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