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Hum in Cary cad 805 AE

Hi Dear fellows.
I recently noticed a hum in one channel of my Cary Cad 805’s.The Hum is present once I switch on the left monoblock.It is not heard through the speakers, only in the amp itself.What could it be the problem??I calibrated the bias of both amps, exchanged power cords, even the 211 tubes but nothing changed...there is still this hum in the left channel.Any recommendations will be more than helpful!

Thanks in advance!
Raf
rafael0054
rafael0054 OP
97 posts
 
Hi Dear fellows.

Finally I decided not to touch anything in the left monoblock.Indeed is a very subtle buzzing in the transformer.I can leave with that, toghether they sound marvellous and I understand that some things must be forgiven in the tube  amplification's world.
Thanks anyway for your opinions!

Cheers!

Raf
rafael0054 OP
97 posts
 
Hi Dear fellows!

I finally brought the two monoblocks channels to a highly reputated technician.The problem was an interstage transformer  , a small one inside the chassis that feed the 211 tube.It was replaced in both channels toghether with bypass capacitors.After that repair the sound is marvellous.No hum at all.

Cheers!
Raf
lak's avatar
lak
3,516 posts
 
Raf, glad to hear that you found the problem and got it repaired.
Now, once again, enjoy the music!
rafael0054 OP
97 posts
 
Thank's lak!!
That's what it's all about!

Cheers
Raf
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