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Re: marantz sr 73 amp/ receiver
what happens when you turn up the volume... does it come back in again... if so it could be a faulty speaker protection relay, or at least dirty contacts to same. Can be fixed by burnishing the contacts. Let me know if sharp increase of vol changes the muting problem
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Some amps have a button which you press to mute the speakers when the headphones are plugged in. Sometimes marked "Speakers on off". If it hasn't then a new headphone socket would not be expensive to fit. As long as the amp producers sound I don't see any future problems. The previous owner may have used the headphone socket a lot, and simply wore it out!
A couple of questions to try and narrow this down:
1) What is the impedence rating for the speakers?
2) When the unit shuts down, will it recover on its own after a little while or do you need to power cycle it to get it to work again?
3) When the unit shuts down, is it hot?
Possible causes of this behavior:
1) Impedence rating too low causing the amp to work too hard and shutdown.
2) Excessive heat (caused by #1?) will shutdown the unit to prevent damage.
3) Possible intermittant short in the speaker wires somewhere? Loose connection?
A little more investigation will be required to find this. A repair shop would run this unit under load and monitor the outputs for heat and any spikes in the signal that could kick in the protection circuits.
problem with electronics is there are so many possibilities! before changing the power amp i suggest u check all the paths from pre-amp to power amp. bad resistors cud be it, faulty capacitor cud be draining power to ground. insufficient power supply to final amp cud also be it. so before making any rash changing pls check all components including the power amp module.