I have a 2000-vintage Arcam Alpha One amp which started to develop crackle and fade out on the right speaker channel a few years back whenever the volume control was moved. Over time this got progressively worse to the point where the fade/crackle would appear spontaneously even when the volume control wasn't touched. Moving the volume control up and down repeatedly and using air duster on the potentiometer gave only temporary fixes. I also tried a small amount of contact cleaner which again gave only temporary relief. Eventually I persuaded Arcam to sell me a replacement volume potentiometer which I successfully replaced myself. This fixed the problem completely for a couple of months but it's now returned worse than ever and is becoming unusable. I gather that potentiometer and switch problems are common on older Alpha amps. Everything else on the amp seems to be working OK. Is there anything else I could try before throwing it out and replacing it? Its used value appears to be in the region of £50, so I don't feel it's worth the £150+P&P Arcam repair fee. Thanks!