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Old 26th October 2007, 10:01 PM   #1
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Default Marantz PM-57 Amplifier

Hi there. I have a Marantz PM-57 amplifier which stopped working whilst being run fairly hard. I have diagnosed a faulty mains transformer and am trying to source a replacement. I am having a hard time locating a spare. Does anyone have any suggestions where I can get my hands on one or a schematic so I can work out what voltages are required or failling this can tell me what output voltages the original transformer gave to replace it? Is there any advantage to me fitting a toroidal transformer instead?
If you could help me out at all I'd be eternally grateful.
Regards,
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Old 26th October 2007, 10:21 PM   #2
Nuuk is offline Nuuk  United Kingdom
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Are you absolutely certain that it is the mains transformer and not a bad connection somewhere? If you have crimped terminals on the mains lead to the power switch etc, try cutting them off and replacing them with new ones.
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Old 27th October 2007, 11:26 AM   #3
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Hi there. Thanks for your reply. Yes I tested the output of the transformer and it is giving nothing. I am guessing it has overheat protection (thermal fuse of some sorts) which has blown.
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Old 27th October 2007, 12:24 PM   #4
Nuuk is offline Nuuk  United Kingdom
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Quote:
Yes I tested the output of the transformer
Nothing in, nothing out is the key here! Please do what I suggested, you may be in for a pleasant surprise!
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Old 27th October 2007, 12:42 PM   #5
Thomo is offline Thomo  United Kingdom
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The boards in these amps are the same as the ones in the later PM66/PM6010.

The transistors are different and some components are also different. But given the huge gains experienced by changing the tx in those amps, I would find the largest va that you can. I cannot remember what voltage they are, but if you find the pm66 mod thread and ask there, I'm sure someone else could tell you.

cheers,

Lee.
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