[R-390] The R-390A IF transformers internal resistors for StewWarner

[Jacques Fortin]

Ah !
Thank you very much Renée,
Make more sense ...
So: 39 K for the IF 1 and 2, input and output.
68K for IF 3, input only.
We need to write that down, now !

73, Jacques, VE2JFE

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la part de Renee K6FSB
Envoyé : 8 octobre 2020 22:11
À : Jacques Fortin <jacques.f at videotron.ca>
Cc : Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
Objet : Re: [R-390] The R-390A IF transformers internal resistors for StewWarner

Jaques- you are indeed correct the white bands had turned yellow between varnish and time they looked yellow until I scraped some and looked under a microscope! lo and behold WHITE!!!!!
so all are 39K Not 34K
Thank you for the push for reassessment.
Renée

On 10/6/20 6:16 PM, Jacques Fortin wrote:
>
> Hello Renée,
>
> Thank you very much for the info, but…
>
> Huh ? 34K ??
>
> Are you sure ?
>
> This is not a standard value…
>
> 33, 36, 39 at 5% are…
>
> Are you sure that the 2^nd color band is really yellow and not white ??
>
> If white, it means 39K, like the resistors in the Capehart IF module I 
> have.
>
> 39K is a standard 5% value, but 34k … never can be, I fear !
>
> My Capehart 3^rd IF is also made by American Trans-Coil, so 68K seems 
> OK there.
>
> *73, Jacques, VE2JFE*
>
> *De :*Renee K6FSB <k6fsb.1 at gmail.com>
> *Envoyé :* 6 octobre 2020 20:19
> *À :* Jacques Fortin <jacques.f at videotron.ca>; R390A List 
> <R-390 at mailman.qth.net> *Objet :* Re: [R-390] The R-390A IF 
> transformers internal resistors for StewWarner
>
> Jacques-yesterday I had a chance to drive and obtain the deck IF deck 
> details Stewart-Warner Electronics P/N SM-D-343621 Order 
> 20139-PC-60-A1-51 S/N 4535
> T501- 34K 5% 1/2W both
> T502- 34K 5% 1/2W both
> T503- 68K 5% 1/2W, none
> T503 appears to have been replaced? interior looks original but the 
> top is marked T503
>  American-Trans-Coil
>  Richmond Hill, L.I.N.Y.
>             121-1
> above is on exterior of IF can
> T501, T502 had no covers when I received the deck, I found odds'n ends 
> covers.
> currently this IF deck is fully operational- my notes state after all 
> bypass caps etc... replaced it worked.
> Hope this helps
> Renée, K6FSB
>