11-07-2014, 06:25 PM
Having carried out some more work on this vintage receiver, I've come to the conclusion that I shall have to fully screen the interlink cable, which will hopefully minimise QRM (if I may use the 'Q' codes on this forum!) When run from my 10amp Bench PSU (actually an -ex Blaupunkt demonstration stand Power supply, BTW) a high level of noise is being picked up. IMHO the reason may be that the outer screen of the original is used as the common (earth) connection between the head unit and the amplifier/power supply box.
