[Amps] Transformer Noise

[2]

>Hi
> I have three amps ....SB200 , SB1000, Dentron Clipperton L ..... They all
>work fine ,But the SB1000 & Clipperton both have Transformer Buzz & hum. The
>SB200 transformer is  super quiet ..... Why is that ??  What is heathkit
>doing that the other are not ?? 

Heath hv transformers are potted. 

>Can I do anything about it......
>
My Web site has info on home-potting with fibreglas laminating resin.  

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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