[R-390] Low audio

[John Page]

     Thanks to all who helped me with my last 390 problem. But here I am 
again.
     Just purchased another one ( R-390A). Jeez, you would think I had 
learned my leason. Oh well, my dad always told me I had to learn things the 
hard way.
     But back to the problem at hand. This one is a Stewart Warner and in 
pretty good shape. It even has the original meters. I got it home and into 
the basment. It needed a new power cord even though the guy had been using 
it I put on a new 3 wire cord. Hooked it up and turned it on and it worked 
very well. All bands worked and all filter positions worked. Well at this 
point I figured I would chnge out the cap in the IF module so I wouldnt lose 
a filter. I used a .01 600v. orange drop.
     Now the first 3 filter positions have very reduced audio. Its there but 
you have to turn the gain up to about 3/4 full. The 4, 8, and 16kc positions 
work normally.
     I checked to see if I had maybe bent some switch terminals or 
something. I took the IF module out of the other one and of course it worked 
fine in the new one. I took a lot of resistance readings on the bad one in 
the filter area following the schematic and couldnt see a problem. Anytime 
something looked suspicious I would measure the same place on the working 
unit. My conclusion is a bad 2kc filter. But it works a little???????
     What does the group think? Thanks in advance. John

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