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,
If you could help me out at all I'd be eternally grateful.
Regards,
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.
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.
Nothing in, nothing out is the key here! Please do what I suggested, you may be in for a pleasant surprise!
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.
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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