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  1. L

    Marshall 1987x making noise

    Thanks for the recommendations. I cleaned the jacks and sockets with very little improvement. Then, just for kicks, checked the adjustment of the hum balance pot. Turns out someone had turned it all the way in one direction. I used a meter to adjust it to the center and then my ear to get rid...
  2. L

    1987x w/fx loop noise

    It is a duplicate. Sorry, I didn't know how to delete it.
  3. L

    Marshall 1987x making noise

    I have a 90's 1987x with an fx loop that makes noise similar to having the instrument cable plugged into the amp but not the guitar (sort of buzzing). The amp makes this noise regardless of whether a cable is plugged into the input or not. With vol 2 turned up to around 3/4 the noise nearly goes...
  4. L

    1987x w/fx loop noise

    I have a 90's 1987x with an fx loop that makes noise similar to having the instrument cable plugged into the amp but not the guitar (sort of buzzing). The amp makes this noise regardless of whether a cable is plugged into the input or not. With vol 2 turned up to around 3/4 the noise nearly...
  5. L

    Long term standby - like - months

    This is a quote from an article written by Hartley Peavey.... EXCESSIVE USE of a standby switch can cause another destructive process within the tube. If the tubes in the amp are allowed to operate for considerable lengths of time with the standby switch off (no B+/high voltage) the cathode...
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    MA50H problem. HELP!!!

    I know this is an old thread but....... I have been working on one of these MA50C's for a local shop. The problem I found was that the low voltage fuse (15v and 14v supply) for the switching and reverb is open. The current draw in this circuit measured across the fuse terminals was 1.5A AC...

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