[R-390] Line filter issues possibly solved!

[AdamAnt316@aol.com]

Yet another update: I think I may finally have found the solution to this 
enigma! I decided to check the line cord connections in the back of the 390A to 
see if the noise went away when taking off the power cord wires. While 
loosening the nut holding the neutral on, I noticed that the connecting lug was moving 
an awful lot along with my loosening attempts. After finally managing to get 
the bolt fully loosened, which badly bent the connecting lug, the noise did 
not go away, so I loosened the nut holding the hot lead, removed ground lead 
from the rear panel, then removed the hot lead from it's terminal on the line 
filter, upon which the noise stopped radiating. Discouraged, I then attempted to 
remount the neutral lead to it's terminal on the line filter, upon which the 
connecting lead began moving surprisingly well in the opposite direction, 
shearing the neutral connecting lug off. I then noticed a crack which went all 
around the ceramic insulator on the line filter. Stress must've cracked the 
insulator at the point where the terminal screw ends, and this allows the terminal 
screw to rotate freely. I suspect that there was enough of a connection to 
allow the radio to work, but it also formed one hell of a diode-like 
semiconducting connection, which sent even the tiniest amount of line noise radiating from 
the line filter out the neutral lead like an antenna. What would be the best 
method to remove the line filter, especially that cramped screw? Also, might 
anyone have a spare line filter lying around that they could spare?
-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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