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Old 16th July 2010, 01:31 PM   #1
Maxxtr0 is offline Maxxtr0  Germany
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Default Denon PMA-510AE Question


Ive just measured the DC-Offset of my Denon PMA-510AE amp.

Left channel: about 10mV
Right channel: between 0mV and 1mV

Both measured after 10 minutes; Cd as input, volume as low as possible, output A, all esle deactivated.

How does it come that the differnce is that big? Can I do anything against it?
There are two potentiometers built in, one for each channel. But it does change the offset only very marginal and the heatsink gets hot pretty fast. So I guess they are there for Bias-adjustment...
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Old 16th July 2010, 08:21 PM   #2
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To test DC offset it is better to do it with the input shorted, rather than use a source.

10mV is nothing to worry about, and is insignificant.
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Old 16th July 2010, 09:17 PM   #3
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Personally I would be delighted with those offsets.

Once it gets to 500mV plus would I start to worry.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 17th July 2010, 01:01 PM   #4
Maxxtr0 is offline Maxxtr0  Germany
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O.K. now i feel relieved...
Will the DC-offset increase with time?
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Old 17th July 2010, 08:02 PM   #5
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It may drift with component age, but it is unlikely to ever cause a serious problem unless the increased DC is due to a fault, at which point the speaker protect circuit (if there is one - i would imagine so in a Denon!) will activate.
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Old 18th July 2010, 01:10 AM   #6
ROXR is offline ROXR  Spain
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Hello, the DC-offset could be known so BIAS.

Normally it take an VR, but if Amp. don't have or if it as my case, problem the overvolt BIAS cause an incremental temperature on the transistor. The ideal is from 3 to 12 mV. undervolting usually is not a problem. I think so.
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