[R-390] Low audio

Thu, 17 Jul 2003 20:45:40 +0000

John Page K4KWM
Hollow State since 1953
(ex W8PKU,N8BLB,NA8O)

>From: "John Page" <[email protected]>
>To: [email protected]
>Subject: [R-390] Low audio
>Date: Wed, 16 Jul 2003 02:59:20 +0000
>
>
>
>     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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