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amp hum

Posted by walkstoslow (A) on January 13, 2017 at 12:52:36

In Reply to: A few comments posted by Frihed89 on January 12, 2017 at 05:24:22:

Hello:
yes, you are correct, the hum is coming from both amplifiers.
I went back to mono mode and listened to each one individually.
These SS amps are old, made in 67 or 68, I believe.
I also just acquired the same amp in kit form.(Heathkit AA 18).
I also got The Heathkit "Electronics Essentials, along with the companion workbook, a course for techs in wanting.
I would like to end up with a trio of identical amps.
First I need to understand where exactly the hum is coming from.
Hence the text books. I have dabbled off and on for many years.
I am thinking the power caps first, to be replaced, and then the coupling caps.
After that it is wide open as what to do next.
Question: This NOS kit that I just acquired, should I plan on replacing the caps now because of the age of this kit?
Hopefully building this amp will help me understand how these things work.
All suggestions and comments are appreciated.
thanks

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