[R-390] thanks

[Roy Morgan]

On Jul 26, 2009, at 2:08 PM, Natan Huffman wrote:

> Friends,
>
>
>
> I want to thank all who had ideas about the nasty hum I had on my  
> 1967 EAC.
> The problem was in the line filter, so I'll replace it and all  
> should be
> well.  The give away was the 60 volts on the chassis!

The 60 volts will appear on an ungrounded chassis if the line filter  
is working correctly.  It's not cleat to me how the line filter can  
cause a mechanical audible hum (that is, not heard in the audio  
output, but rather coming from the radio itself.)

Can someone explain this to me?  (I certainly can explain the 60 volts.)

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073
Home: 607-898-3607
Cell: 301-928-7794