denon pma 250 annoying problem

ollyjay1982 · 10th April 2011, 06:58 PM

my denon pma 250 has developed a very annoying problem, at low volumes and on songs with little or no bass, the amp really struggles, it's difficult to describe but it sounds like you're playing a very worn out tape, once you turn it up and play something loud or bassy it clears up. i've tried cleaning it but no joy. help!

Arty · 10th April 2011, 07:51 PM

i would vote that the putput transistors are the ones responsible for that.
Push-Pull Output Stage
not familiar with that amp, but if it has a push-pull output stage- probably it has- then the bias has changed and what you hear as strugling is the distorsion it creates.

toprepairman · 14th April 2011, 11:40 AM

Hi Olly.
Did you sort out the problem?
Henry

10th April 2011, 06:58 PM	#1
ollyjay1982 diyAudio Member Join Date: Apr 2011 Location: north devon	denon pma 250 annoying problem my denon pma 250 has developed a very annoying problem, at low volumes and on songs with little or no bass, the amp really struggles, it's difficult to describe but it sounds like you're playing a very worn out tape, once you turn it up and play something loud or bassy it clears up. i've tried cleaning it but no joy. help!

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10th April 2011, 07:51 PM	#2
Arty diyAudio Member Join Date: Feb 2011	i would vote that the putput transistors are the ones responsible for that. Push-Pull Output Stage not familiar with that amp, but if it has a push-pull output stage- probably it has- then the bias has changed and what you hear as strugling is the distorsion it creates.

14th April 2011, 11:40 AM	#3
toprepairman diyAudio Member Join Date: Nov 2010	Hi Olly. Did you sort out the problem? Henry

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