Noise & Tripping AMP - I am ay my wits end
I have a PC, Musical Fidelity X24 DAC and an arcam 9 pre and power amp with two sets of speakers on the power amp (celestion A and some other brand). For about 3 years I have had the problem of the AMP tripping. Usually first thing in the morning and mostly in winter (its in a cupboard under the stairs but that's not that cold) I have had my arcam serviced by the manufacturer, i have replaced every cable (including speaker cable that was channeled in wall and run under floor boards. I have done everything. I even at one point got the amp to trip with just the amp and speakers connected (then got the amp serviced and ran a new set of speaker cables and tried different speakers). So it MUST be the ampo...and yet it can't be the amp. Arcam said it was OK apart from a knob that they replaced ... all for £150.I have tested the speaker cables for continuity. They are OKI have replaced the high quality interconnects.I have a mains filter. I have tried powering from a different ring mains via an extension lead.(I have just bought soem ferritin things that go around the cables) I have a high quality SB sound card and also a lower quality inbuilt soundcard that luckily has an infrred port (using the latter doesn't solve the problem either!)SOHINT: It seems to trip when there is quite a bit of hummingIf I fiddle with the interconnects and/or the speaker wire then I can get the humming to stop (although it will come back the next day)So because there is hummning then there must be some sort of interferenceAm I right that if there is a lot of humming this can create a DC current and that is what trips the amp? Anyway. What can I do to resolve this apart from moving house and buying a new hi-fi?ANY SUGGESTIONS however stupid will be apprecaited especially if it solves the problem.