[R-390] To un-mod or not

[D. ball]

I have just recently bought a 59� Steward-Warner. It is in really good 
condition but with some mods. My first question is, a co-worker who worked 
on the 390�s in the service believes that if a mod was done by military 
personal under factory approved updates then that mod should be considered  
�stock�, and under a collectors point of view it be valid.

I would like to know if the 85� vintage radios had tubes instead of diodes.

Secondly is someone made some IF mods in my radio. V506 seems to be a 
diferential product detector now. And there are various diodes in the AGC 
section which I have not mapped out. It all works very nice. But I don�t use 
the radio that way. I use the IF out. That way I can play and not cut up the 
radio : )  I notice that when I use my Kenwood 930s as the demodulator (with 
60db of pad) I get very good results with the 390 on MGC. I am wondering if 
the stock ACG would work better using the 390 as a down converter only.

I don�t plan on selling this radio, the best city radio ever!! With the 
kenwood 930 dialed up on 455kc +/- some, and the 390 as the front end, I 
hear things neither radio can hear by itself. It is a scary combination.


thanks

joe
ke1mb

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