[R-390] New Project (More Questions)

[Scott Bauer]

 I believe Tung Sol prints 3223 on some of their 5814A's. The White 
paint marking the tube
with 5814 or 12AU7 rubs off but the permanently marked 3223 remains.

Scott

Craig C. Heaton wrote:
> Hi Joe,
>
> 1. 3223's I don't think so, stick with 5814's. Collins had good reasons
> using the tubes chosen.
>
> 2. So far, I've only had experience with BBOD's and Vitamin Q's. BBOD were
> old, worn out, they served their country well. Orange Drops were the
> replacement for the BBOD's. Most of the Vitamin Q's were good, not all.
> Orange Drops used there too. The set was a Motorola 56 vintage.
>
> 3. If your set still has BBOD's, next recap, the realign IF and RF sections.
>
> 4. Could be old caps (BBOD's), needing alignment. With a receiver worthy of
> going back on line at a listening post, I would expect: with switch on MGC,
> with the IF output connected to a scope, RF gain full clockwise, with a
> strong signal; you should see and hear overload.
>
> You are getting there, don't stop now. After a couple days of recapping,
> several tries of realignment, it will all come together. The R-390/A will
> become a working receiver.
>
> Then you will want a excellent receiving R-390/A. That's flowertimes's
> story, I've saved his notes.
>
> wd8kdg
> Craig
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Carole White-Connor
> Sent: Saturday, February 24, 2007 6:36 PM
> To: r-390 at mailman.qth.net
> Subject: Re: [R-390] New Project (More Questions)
>
>
> Today, I redid the filter caps, replaced the "exploding" cap and adjusted
> the IF
> gain. The set is performing nicely, but I have a few more questions:
>
> 1. The AF deck had two 3223 tubes in place of the 5814As. Is that an
> acceptable
> substitute? I replaced them with NOS 5814s.
>
> 2. Some of the caps are Westcaps. Are these like the usually reliable
> Vitamin Qs or
> like the unreliable brown/black beauties?
>
> 3. The two bands that are relatively weak are 2-3 mhz and 3-4 mhz. Any ideas
> on
> where I should look for the problem?
>
> 4. WHen I switch from AGC to MGC, I don't get the jump in signal strength I
> expect.
> It doesn't overload on MGC, even on relatively strong stations. Is that
> normal? If
> not, what should I be looking at?
>
> Again, thanks for all your help. There is nothing better than advice from
> guys who
> have been under the hood of these sets.
>
> Joe Connor
>
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