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Music Man HD-130.
I received this Music Man HD-130 amplifier with the complaint that it hums.
The four output tubes are 5881WXT. The owner replaced the two main filter caps himself and said it didn't correct the problem. When I opened the unit and found one of the yellow wires hanging loose from one of the filter caps, I soldered it to the other yellow wire which was connected to the filter cap. See photos he http://www.pbase.com/image/57610175.jpg http://www.pbase.com/image/57610176.jpg http://www.pbase.com/image/57610312.jpg http://www.pbase.com/image/57610174.jpg Now the amp is drawing too much current at idle and I definitely need to check the wiring to the filter caps. I don't service many tube amps like this. Does anyone have a schematic of this set? I tried the ernieball.com website but it's not listed there. Thanks for your reply. -- David Farber David Farber's Service Center L.A., CA |
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