NAD C340 has lost ability to switch between inputs

I have the same problem which started about a month ago and seems to be getting worse. I also noticed today, that 1 channel is significantly louder than the other - fault in the pre-amp stage, as feeding the power stage directly gives balanced, albeit extremely loud sound! Looking on eBay, I found someone else selling an amp with both problems. It would nice to think that NAD would acknowledge a design flaw, and fix for free, but my amp is 5 year old.

Hey,

sounds to me like they have used a chip to switch between the inputs and not relay's?

If that's the problem, only solution is to find someone to replace the chip. Often denon and cambridge use this kind of 'easy' and cheap work around remote controlled input selection.
In several of the nad's i have repaired, they used relays, so i will bee surprised if nad use chips also?.

best regards michael miguelovitch

By mentioning "All inputs are active at all times." are you saying that all INPUTS lights are lit up at the same time? Or is it that you select a particular input option - say TAPE, and while the TAPE indicator Light gets lit, there is no sound coming from the speakers? In most Amplifiers, Input selections are routed through a couple of Relays. So, over time, the contacts of the Relay get dirty and signal does pass across. I suggest that you ask the Tech Store guys to have a look at the Switching Relays, and if suspect, replace.