Denon PMA-510AE Question

Maxxtr0 · 16th July 2010, 01:31 PM

Hello!

I´ve 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...

jaycee · 16th July 2010, 08:21 PM

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.

nigelwright7557 · 16th July 2010, 09:17 PM

Personally I would be delighted with those offsets.

Once it gets to 500mV plus would I start to worry.

Maxxtr0 · 17th July 2010, 01:01 PM

O.K. now i feel relieved...

Will the DC-offset increase with time?

jaycee · 17th July 2010, 08:02 PM

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.

ROXR · 18th July 2010, 01:10 AM

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.

16th July 2010, 01:31 PM	#1
Maxxtr0 diyAudio Member Join Date: Sep 2009 Location: Bavaria	Denon PMA-510AE Question Hello! I´ve 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...

16th July 2010, 09:17 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Personally I would be delighted with those offsets. Once it gets to 500mV plus would I start to worry. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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16th July 2010, 08:21 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

17th July 2010, 01:01 PM	#4
Maxxtr0 diyAudio Member Join Date: Sep 2009 Location: Bavaria	O.K. now i feel relieved... Will the DC-offset increase with time?

17th July 2010, 08:02 PM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

18th July 2010, 01:10 AM	#6
ROXR diyAudio Member Join Date: Jul 2010	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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