Loss of sound in one channel 2016-12-06 08:44:47 Hi all,Recently purchased some new Tannoy Revolution XT6F speakers and since then have been experiencing a weird issue with my setup. The speakers are driven by a Cambridge Audio 640A, with two sources: a Chromecast audio, and a little CYP dac connected to my TV's optical out. Intermittently, one channel will go extremely quiet, and slightly crackly. Perturbing the cables on either end does not alter the sound at all, neither does fiddling with the RCA input connections. I've tried disconnecting the source at the other end - i.e. removing the 3.5mm jack from the Chromecast audio - and then reconnecting it, but the problem persists. What fixes it is flipping the input selection to another source, then back again. On switching back, the balance has returned and sound is coming out of both channels as expected. One other thing to mention is that I THINK - I can't be any more certain than that because I've only just started to keep a log of the issue - it has happened to both channels (just not at the same time).I have a physics background, but certainly not electronics I have discussed it with a colleague at work who is a lot more knowledgeable in this area than myself and he suggested there might be a problem with the power stage, although he thought it was strange that both channels have been independently affected since they have independent power amps. The amp is probably around 10 years old (possibly even older), so we also discussed that the caps might be reaching the end of their life and could probably be fairly easily replaced. I'm more than happy to get the soldering iron out if I have to!Does this sound like a plausible explanation to anyone here, or has anyone experienced a similar issue with an alternative cause? I am conscious that this problem appears to have only surfaced upon the addition of the new speakers, but the fact that the input switching provides temporary relief would seem to suggest the speakers themselves are not the cause....Any help anyone can provide would be much appreciated! Thanks.