I had the same popping problem in the right channel. Sent it to Signal Path and it WAS a bad tube. It's funny but all the reviews and MF literature say a tube has never"failed in the field." What is that about? Their tech was non responsive when I enquired by letter about this. But the tube was replaced and unit is fine
Popping from right channel of Musical Fidelkw500
I am getting a popping/crackling sound from the right channel connection of a Musical Fidelity KW500. It exhibits this behavior with no source connected. The sound gets louder as the volume is turned up. This behavior is also noticed if I connect the preamp outs to another amp and connect speakers to the other amp. I have tried different speakers and have the same result. Any thoughts on what the problem could be? Thanks