[R-390] R-390 (Non A) For Use With CY-979A Cabinet???

[David C. Hallam]

Bruce,

Again I can't don't know if that particular cabinet was designed with the
R-390 or not.  Even if it was, IMHO you are making an unwarranted assumption
that the "engineers got it right".  If you are not operating the proverbial
24/7, there may be no issues.  Me, I prefer lots of air.  After I had to
replace the cathode resistors and the 26Z5's a couple of times, I put the
cooling fan in place.  That was about 20 years ago and I have had no
problems since.

David
KC2JD/4

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of triodes at optonline.net
> Sent: Tuesday, April 08, 2008 6:15 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] R-390 (Non A) For Use With CY-979A Cabinet???
>
>
>  Guys,
>
> Thank you for all of the comments and replies with regard to my inquiry.
>
> I guess the real question here is as follows: was the CY-979A
> designed for use with the R-390, or only the R-390A receiver? If
> it was designed for use with the R-390 (non "A" version), I think
> we can safely assume that the engineers at the time did think
> through the heat load and related thermal considerations in the
> design of the CY-979A, so as to provide a safe operating
> temperature without jeopardizing the long-term reliability of the
> receiver.
>
> Yes, the R-390 runs hot, hotter than the R-390A. But objectively,
> if indeed the CY-979A was designed for use with the R-390, there
> should be no issues.
>
> Does anyone know when the CY-979A was first introduced to the
> military? If the introduction date was during the original R-389
> or R-390 production period, that may conceivably mean something
> here. If it was introduced during the run of the R-390A, perhaps
> that would indirectly infer that it was designed for use with
> that receiver unit only.
>
> Thanks & 73,
>
> Bruce, W2XR
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