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Problem with right channel on vintage Denon PMA-501 amplifier. No sound... Any advice? Thanks...

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Good day sir/maam, to verify if the right channel is the problem, swap the speakers to confirm. Assuming that the right channel is the problem, set the balance control to the right (or simply disconnect the left speaker) and place you ear near the problem right speaker. Adjust the volume control up and down several times. you should hear a soft hiss that goes up and down also. this comfirm that the power amplifier stage is good. the problem is anywhere from the tuner/tape/cd/switch or jack. If you dont hear the hiss sound then the power amplifier is the problem. in both cases, you may need to bring it to a service center. hope this helps.

Posted on Jul 21, 2009

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Distortion appears while trurnning up the volume on right channell


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Did you checked balanced impedance?load speaker impedance vs PA output?or PA might over driven,causing a trouble on the pre-amp to power amp circuits and components damage,
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Note: That,blowing of fuses with the same rating is an indication of trouble/shorted in a circuits that driven on it,

Thanks and good luck

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1 Answer

My Denon PMA-900V integrated amp has distortion in the left channel. When it is cold it is very minor, as it heats up and is played at louder volume the distortion is much worse.


The good news is that it's in one channel, which means you have the right channel parts to compare it with. Now the bad news whatever causing it and it's likely to be a semi-conductor (transistor or IC) has to be replaced. However finding it is easier than you might think. For a start it's going to be hot to touch. And you can get get it to stop being hot, while the amps on, so correcting the fault, for a while. You do this by spraying it with Servisol Super Freezer spray. You have to have the amp running for this. Find the left channel amp and wait while it goes bad. Then spray (one at a time) any part you suspect. If the sound returns to normal, you have found the faulty part! To prove it spray the same in the right channel. That shouldn't change.
You can get the freezer spray from your local electric parts shop (such as Maplin UK).

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I have a denon pma 500v amp, has distortion in right channel, both speaker output and headphones, what should i check for first?


Just have a look around first. Remember the left channel will be the same as the right, so if it doesn't look the same in the right as the left you have the cause of the problem. Resistors are good at causing it, but transistors can too.

Nov 27, 2010 | Denon Audio Players & Recorders

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That model shouldnt be stuck in stand-by
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Try a set of headphones and see if the high end works in those.
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Operating Instructions, Denon PMA-535R/PMA-735R


Hi there
You can download one from here Select the FREE download button and you will get a PDF copy of the manual. Let me know if you have any problems getting it. Cheers
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1 Answer

My denon amplifer was playing okay then the trebel


Determine if it is both left and right channels. If it is then you are looking for something that is common to both channels as the cause. It could be something to do with the tone circuit, perhaps an IC, another suspect is the bias section. And if only in one channel then at least you have something to compare it when seeking the fault.

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Volume control needed


have yoou tried to find in ebay.? they should have one there.

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