[R-390] RE: New R390A owner with some questions.

[Walter Wilson]

Paul,

If the problem is only in the 1-2 MC range and does not include 18-19 
MC, it won't be a crystal.  It will be the 1-2 MC section of the RF 
deck.  You may have the slug rack getting stuck, an RF can gone bad, a 
busted gear clamp, or broken slugs.  First, set the frequency to 7+000 
(1KC above 7 999) and see if the camshaft at the back of the 1-2 MC 
range aligns properly.  Then move the KC knob throughout the 1-2 MC 
range, watching the movement of this slug rack in particular.

Walter Wilson - KK4DF

W4QG wrote:

>Hello All,
>
>I have been lurking around for a while on the
>list, my complements to all for this great resource.
>This is my first post and I have a few questions for 
>the newsgroup.
>
>I recently acquired 2 R-390As.
>
>One is a mostly functional Stewart Warner radio.
>
>While twiddling knobs I have discovered a few things:
>Radio works on all bands that I have tested so far
>except 1000kc to 2000kc. Seems stone dead on that
>band. Any ideas where to look first for problems?
>The radio appears to be very clean and so far I
>have not found any obvious modifications 
>(still has a functional ballast tube).
>
>Also, engaging the sharp position with the audio 
>response switch seems to kill the audio no matter
>what mode it is in.
>
>I am in the process of downloading/printing the
>maintenance and operators manuals today. Any other
>documentation I should be thinking about acquiring?
>
>The second radio is somewhat of a mystery.
>Not operational yet but it does power up.
>
>The nameplate says "ITT Electro-Physics Laboratory".
>I did find a list on a website of the dozen or so 
>R-390A manufacturers and ITT was not listed. So, I am assuming
>that someone else made this one and ITT just put their 
>label on it. My question is, how do I go about finding out by who and
>when was it made?
>
>Finally, I am planning on making the inrush limiter modification,
>and changing both radios to a three prong plug. Is there a preferred
>way to handle the 2 wire to 3 wire power cord change?
>
>
>Thanks!
>
>Paul W4QG
>
>
>
>
>
>
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