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Old 17th July 2012, 04:54 PM   #1
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Default MARSHALL 9200

1 valve shorted out ,now low distorted output ,output transformer or other componenent ,any help on what to check would be greatly appreciated many thanks.
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Old 17th July 2012, 05:13 PM   #2
kevinkr is offline kevinkr  United States
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Moving to Instruments and Amps per forum policy.
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Tubes / Valves All about our sweet vacuum tubes Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum
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Instruments and Amps Everything that makes music, Especially including instrument amps.
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Old 17th July 2012, 11:33 PM   #3
Enzo is offline Enzo  United States
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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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