Need Help Trouble shooting

I just went through the same motion..The problem was traced to my preamplifier tubes..not from the amplifier..
It was by trial and error and labeling each tube every test so you do not mix them up..
good luck

Thanks Grant

Further update I swapped out cdp and put in the tuner and the hum is gone !!!!
The source is definitely the issue.. would tubes in the CD Player be the only culprit or should I get the cdp in for a check up as well

You guys have made my day

Cheers

Any tube recommendations for the Exemplar that works well
I belive I have standard 5965 tubes in mine.

Thanks Guys
You've been very helpfull.

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

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

It could be a defective cable. Happened to me on several occasions. Try another pair. Good luck, Dave

swap those tubes (one channel at a time) also.