[R-390] Continuing on the R-390A .........

[email protected] [email protected]
Sun, 9 Feb 2003 13:36:26 -0600


I now have this unit completely apart and am going through 
it looking for defective parts, etc. First, I'd like to thank all 
the people who made the Y2K R2 manual available on-line.
Really great job guys. Unit sure comes apart easily ....but I
guess you knew that (I didn't). 

What I'd like to know is, what are the suggested functional
modifications (I'm a little confused by all the postings over 
the past few years) which I might as well implement while 
it's apart.

It's a 1967-68 R-390A built by EAC (parts are stamped with
around 9/67 date codes).

So far I have:

1) replace the AC filter with one that does not make the chassis
   "warm" and trip GFIs
2) add a 3-wire power cord
3) substitute modern electrolytic "innards" for C603 and C606
4) replace the carrier meter potentiometer with a good 100 
   ohm, 10 turn, potentiometer. 
5) add Dallas Langston's two diode AGC fix for SSB 

What else ?

73  Kees K5BCQ