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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
roxy54's avatar
roxy54
2,651 posts
 
Sounds like transformer hum. Is it secured tightly? even if it is, they still hum sometimes.
kalali's avatar
kalali
1,645 posts
 
Transformers sound is typically more like a buzzing at or around the 60Hz frequency but depending on its surroundings and/or how its attached to the chassis it could sound damped and closer to a hum.
rafael0054 OP
97 posts
 
Thanks for feedback!
I opened the monoblock and look at the screws of transformers,  all of them were tight.So I don't know what to say.Could it be due to the rosin or parafine tha covers the big transformers??Actually the sound is more like a buzzing around 60hz.
Any suggestion??Is it posiible to solve it or must I do to get used to this buzzing?
Thanks for your opinions.

Raf


lak's avatar
Ag insider logo xs@2x
lak
3,516 posts
 
Raf,
Why don't you contact the manufacturer with your question and see what they suggest?
kalali's avatar
kalali
1,645 posts
 
I'm not familiar with this particular amp but if it has an IEC connector, try a different power cord and see if the buzzing subsides. When I was looking for power cords, there were a couple that caused my amp's transformer to make a very slight but audible buzz. Not sure why but they did. How old is they amp?
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