Sorry, newbe here with a bizarre problem.. I have a separates system and though some bits are ancient, like the PL12D deck it used to work fine. Recently after about 15 - 20 minutes the right channel will crackle and then go dead, intermittently breaking back to normal volume. This happens with tuner / CD / phono / aux. inputs. No difference. I've checked the usual suspects. The wiring to the speakers is fine, the plugs are soldered on and the connections are tight. If I swap round the speakers it is still the right channel one that fails. Now the odd thing is if I physically touch or tap the speaker cone it all comes back for a few moments. It almost seems as if a DC voltage is permanently polarizing that channel. It seems OK with headphones. Any thoughts please?