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Denon PMA-520 amplifier clicking noise

I have a Denon PMA-520 amplifier - once it has been on for a while there is a clicking noise from the speakers. Its starts at a low level but gets louder the longer the amp is on. Its about 4 clicks a second. Any ideas?

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  • martin_deele Nov 03, 2009

    That was my thought too, especially as the clicking came from both speakers irrespective of the volume setting.

    My main problem is getting it out of the rack - I took the plunge today and removed the lid. Plenty of dust which I have now removed but no sign of failing electrolytics. My main focus were the 4 big 56v 5600uF beasts in the PSU but they looked OK. All the other small audio elecs were visually OK.

    Anyway, its back in line and I'll leave it on to see if the click return.

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Sounds to me like a bad capacitor, but not sure. I would look inside for any slightly bulging capacitors or capacitors whose plastic wrappings have melted or shrunk or cracked (most caps are cylindrical). Please unplug first and be careful inside there and do not touch anything. I actually came across your post while looking for info on what I think is the same amp my brothers had but blew, and I was going to ask if they still had it so I could repair it. I've been very successful at repairing my electronic equipment such as Altec Lansing Model 95 speaker crossovers, power supply in Emu Emax II, and almost everything else in my studio.

Posted on Oct 29, 2009

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The clicking is the reed relays used to actually switch the input source. The switch or the connections to it has/have gone faulty. It's not actually a normal switch AFAIK - it just sends a pulse to the circuit controlling the relays every time it clicks round a position. I'm going to dismantle mine (kill or cure time!) and see what I can find...

Posted on Nov 23, 2012

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