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JCM 900 4100

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  • JCM 900 4100

    I power amp up and let it warm up. Take it out of standby and use it. Put it back in standby and it pops,crackles and makes all kinds of noise. Pops when I power off. Pops when I plug guitar in and out ,when not in standby mode. Are the rocker switches bad? Tubes ? Thanks.

  • #2
    The circuit board in the rear of the amp, where the speaker jacks are...
    tends to arc and burn. I have seen a hole, burned right through the board.
    Click image for larger version

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    As you can see, somebody already cut the carbon spot out of this amp...
    I'm afraid this amp has a "hot spot" on that board. Seen several burn right in that spot.

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