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  1. S

    JCM900 4100 high plate voltage! Any help

    Thanks RussBert, I'll check for burnt traces and re-solder suspect joints. I thought I'd check to see if I'm producing any audio through the pre-amp by hooking up the line out to another amp input, it is not producing any audio through line out either. Would this substantiate what you think...
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    JCM900 4100 high plate voltage! Any help

    Hello everyone. I bought a Marshall JCM900 4100 for repair. The guy I bought it off, told me that it just faded out.. I thought great.. New tubes and I'm away! One of the pins was missing off one of the EL34A's so I bought four new tubes. HOWEVER.....The pico fuse had been snipped on one...
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    JCM900 Help - fault

    Hi all. I hope you don't mind if I jump in here to carry on with this thread. I bought a Marshall JCM900 4100 for repair. The guy I bought it off, told me that it just faded out.. I thought great.. New tubes and I'm away! One of the pins was missing off one of the EL34A's so I bought four new...
  4. S

    JCM900 Help - fault

    I bought a faulty JCM900 4100. It has EL34's. One tube was broken so I bought 4 new ones. I replaced the four 2K2 4w resistors with 1K 5w and also installed R35 which was an absent 100R 5w. The pico fuse was dead and cut! I replaced C15 with a 47n 1000v instead of 47n 250v. Seemed good to go...
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    MF350 Mode 4 Trouble

    I like all the other members, agree that it probably wasn't the transformer, but more than likely the fusible resistors R23, R44. I did read maybe 2-3 times check the fuses! I discovered one of these to be open circuit instead of 2R2 so this would definitely give his amp the symptoms he...
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    MF350 Mode 4 Trouble

    I've gone through all of this, changed all four TDA7293's measured HT volt at 99V and I am getting 99V at the connections to all four IC's. I have replaced the zeners, caps transistor and diode in the standby circuit, and after all of that I am still not getting an output. The preamp works...
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