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

Sat, 29 Dec 2001 23:07:47 -0800

Both V508 (next to the ballast tube) and the PTO (V701) tube should be 12 v
tubes.  The filament supply voltage is 25 volts.   V508 and V701 can be
lowly 12BA6's.

Has been running here this way since I put tubes in the R390 when it was
obtained.  Pins 2 and 7 of the ballast tube socket are jumpered.

Thanks to Gerald, K6QY for help setting up this one.

73 de Bill, AB6MT
[email protected]

----- Original Message -----
From: "Kenneth Crips" <[email protected]>
To: <[email protected]>
Sent: Saturday, December 29, 2001 6:24 PM
Subject: [R-390] My R390A lives again!!!

>
>
> 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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