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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
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
Post removed 
musicfile OP
341 posts
 
Thanks
It's not the interconnects for this testing I put in another pair of interconnects and the humming still exists

Anyone know what tubes go into an Exempar Denon 2900
Is it easy to swap these out
Post removed 
musicfile OP
341 posts
 
Thanks Guys
You've been very helpfull.
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