[R-390] My R390A lives again!!!

[Kenneth Crips]

Well My 67 EAC R390 lives again.  The Ballast tube was bad. I replaced
it using a 12BH7 as suggested here and nicely documented in A.J. 
Carmody's(AAR2QR/W2LE) excellent "The R390 Cookbook".  It turned out
I had more then one problem.  There was a bad 6C4 in the RF deck.
I have a ample supply of brand new JAN 6C4's in their original packaging
so I replaced all of them. The radio would now play for a few seconds
and then go away to white noise. I noted an interesting thing, V505 (5749) 
did not light because the 3TF7 was bad, with the change out to the 12BH7 it 
lit up but it seemed to be too bright. I decided at this point to change out 
the tube on the PTO V701(5749)(Cosmos). This time when I turned on the unit 
V505 lit up at what I would consider a normal brightness, and the R390 
worked.  I haven't taken a look at the schematics, but it would seem at this 
point if V505 is overly bright it might indicate a problem with V701.

Thanks Hank, and company, I could not have done this without the
"MANUAL".

                           Ken




Kenneth A. Crips, Amateur Radio Station W7ITC,
Home of the Chew Crew.  Razz, Beezie, and Morgan.
Cheyenne, Wyoming's Irish Terriers with an attitude.





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