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Hi I have an Maraantz PM -50 trying to use it as a pre amp for my son;s DJ all of a sudden the right channel has stop other than a hum, left is fine is it worth getting fix ??

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Hi,

If it is the pre out that the hum is coming from, it will probably just have dry solder joints to the RCA connection to that channel. Easy fix, but you will have to pull the entire bottom chassis of the amp to get to them. That particular model does not have a removable bottom. No biggy, just take all the screws out of the back, bottom and around the front escutcheon as well. Leave the transformer attached to the bottom though and just lift the PCB clear to get to the sockets across the back. If you have any questions about it, just ask away :)

You may even be able to get in there enough to resolder the rear connectors by removing the entire back panel even. I remember fixing heaps of these amps. They blew outputs regularly.

regards
robotek

Posted on Nov 04, 2008

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Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.

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Yes amps buzz when something gets near them - say a pen or probe and if you know what it is safe to touch a finger! Fortunatly for you the left channel is the same as the right. So if you believe it's the pre-amp work backwards from the where the power amp connects to the pre-amp, going through the pre-amp stage by stage - prodding the parts. Remember a buzz in the right a buzz in the left! No buzz in the left but one in the right fault found!
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first of all you can check either amp or pre is defect. for this change wiring left to right and right to left (pre to amp wiring). if still left channel has no sound the problemmaker is the amp. would be helpfull for further assistance if i know the model number.
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