Hi, I have a Marantz PM6004 audio amplifier that sometimes cuts out on one channel (can be either channel) when I switch source direct on or off at low volume. Also does the same if I switch between speakers A and B. If I turn the volume up the problem resolves itself. I have cleaned the volume pot and the A, B and Source Direct switches with Servisol contact cleaner. But the problem is exactly the same. Also I don't think it's the Bass, Treble or Balance controls as source direct bypasses those. The speakers are fine as they work perfectly with another amp. And I think the connections from the amp to the speakers are fine too. I read somewhere that the relay can cause this problem. The relay looks like a sealed unit (please see photo) so I'm not sure if it can be cleaned. There is a site selling a new relay ( HANDOUK BC3-12) , spares2repair at £16.99 but Im not sure if I want to buy one if its may not definitely be the cause of the problem. If the relay may be the cause but I can't get into it to clean the contacts properly could I simply drill a small hole in the relay case and squirt some contact cleaner in it? I have been running two pairs of 6 ohm speakers on the amp (the manual specifies minimum 8 ohm speakers if running 2 pairs) is it possible I have damaged the amp? I have never turned it up more than half volume.
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