Marantz PM66 SE PSU help please?

audio_tony · 9th October 2010, 06:23 PM

I have just repaired a PM66 SE, but now seem to have some very warm running regulator transistors in the PSU.

Q801/Q802 below are running very warm - uncomfortably warm I think.

I appreciate there is quite a voltage drop across them - but is it normal for them to run so hot? I realise this is a subjective question

The amp appears to be working perfectly by the way - and nothing else seems to be getting hot.

TIA

jaycee · 9th October 2010, 06:43 PM

My experience of such regulators tells me this is completely normal. If you can fit some heatsinks to them (or improve the existing ones!) then do so.

To make it worse it looks like they have used an insulated device - so if there is any heatsink fitted to them, it isnt as effective.

9th October 2010, 06:23 PM	#1
audio_tony diyAudio Member Join Date: Aug 2004 Location: UK	Marantz PM66 SE PSU help please? I have just repaired a PM66 SE, but now seem to have some very warm running regulator transistors in the PSU. Q801/Q802 below are running very warm - uncomfortably warm I think. I appreciate there is quite a voltage drop across them - but is it normal for them to run so hot? I realise this is a subjective question The amp appears to be working perfectly by the way - and nothing else seems to be getting hot. TIA __________________ Searchable DAC list (now in a database). * Easy searching of DAC chips / transport etc. *

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9th October 2010, 06:43 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	My experience of such regulators tells me this is completely normal. If you can fit some heatsinks to them (or improve the existing ones!) then do so. To make it worse it looks like they have used an insulated device - so if there is any heatsink fitted to them, it isnt as effective.

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