[R-390] Re: Line filter issues?

[AdamAnt316@aol.com]

Yet another update on this project; it now seems as if this set is once again 
taunting my attempts to troubleshoot it's apparent issues. Earlier tonight, I 
decided to do yet another test on this set. After slowly turning it on with 
my General Radio Variac, it began buzzing once it warmed up, as usual. I then 
went inside my house, which is around 50 feet from my shop, to retrieve my 
pocket transistor radio. While in the house, I decided to turn it on, and I 
discovered that I was all of a sudden getting the same buzzing in the house that I 
had earlier been getting in the shop within a few feet of the 390A. I 
immediately suspected a dimmer-type toggle switch in our kitchen, which has a tendency 
to put out hash when not turned up all the way, and it was indeed at around 
90% of it's brightness level (where it tends to stick when casually being turned 
on). Sliding it the rest of the way up eliminated the buzzing on the 
transistor radio; when I got back to the shop, the noise level on the 390A had fallen 
to normal levels. While this is somewhat of a good sign, I'm still wary of the 
set, since this definitely doesn't explain how the transistor radio was 
formerly able to pick up buzzing from the 390A unless it was unplugged from it's 
power source. I will continue to monitor the BC band noise levels to see if/when 
the problem returns.
-Adam

Adam Vaughn 
Collector of old computers, video game systems, radios and other electronic 
equipment... 
Visit my page at
http://www.angelfire.com/ma2/AdamVon/index.html


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