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Old 10th April 2011, 06:58 PM   #1
diyAudio Member
Join Date: Apr 2011
Location: north devon
Angry 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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Old 10th April 2011, 07:51 PM   #2
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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.
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Old 14th April 2011, 11:40 AM   #3
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Join Date: Nov 2010
Hi Olly.
Did you sort out the problem?
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