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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
wshields
bonesetter2004
13 posts
 
I had the same problem when mine was just a few months old. Had to send it back to MF - they said it was NOT the valve as i had first thought BUT did not give a satisfactory answer to what the fault was. It did sound just like the valve to me, but i am no expert
dubwise1
5 posts
 
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
mboldda1's avatar
mboldda1
575 posts
 
can you swap the tubes around to see if the popping noise changes channels?
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