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Need Help Trouble shooting

I Have a hum coming from my right speaker
I tried swapping speaker leads and the hum moves to the other speaker
i'm thinking it's a tube and i'ts my amp that is the issue
If it is a tube not sure if it's the output or input tubes I should be looking at
The pre when in operate mode without Amps on the hum is gone

Help me trouble shoot further
musicfile
joeylawn36111
574 posts
 
swap those tubes (one channel at a time) also.
Post removed 
dopogue
1,773 posts
 
It could be a defective cable. Happened to me on several occasions. Try another pair. Good luck, Dave
musicfile OP
341 posts
 
I did a bit more trouble shooting
and swapping out the interconnect from pre to cdp caused the hum to switch to the other speaker ??
I swapped amp tubes from side to side (monoblocks)
I swapped tubes in my pre amp no difference the hum still exists

Maybe it could be the source
If I hooked up my tuner and the hum disapears is it safe to say it's the source or tubes in the source
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