[Premium-Rx] r390 Audio Transformer

[Clifford Hynds]

I don't know if they are exactly what you are looking for but

I bought a couple from China on Ebay to use on my Line out of my
receivers. WJ8718A and Plessey ,

rgds
Cliff

On Mon, May 14, 2012 at 2:00 AM,  <premium-rx-request at mailman.qth.net> wrote:
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> Today's Topics:
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>   1. OT But still premium. (David Schofield)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Sat, 12 May 2012 18:21:15 +0100
> From: "David Schofield" <davesc50 at tiscali.co.uk>
> Subject: [Premium-Rx] OT But still premium.
> To: <Premium-Rx at mailman.qth.net>
> Message-ID: <25E61D4430F14EFB8CE89ACE8C88F8F3 at radioroomxp>
> Content-Type: text/plain;       charset="iso-8859-1"
>
> Hi All,
>
> Can anyone out there help, I'm looking for an audio output transformer for an R-390 receiver T602.
>
> It's a reasonably common transformer in receivers of this vintage, having a 10K primary and two 300R secondaries (usually connected in series to give 600R).
> The one in my receiver has an open circuit primary winding, and although I could replace it with a modern unit, it would be nice to find an original part.
>
> So to that end I'm looking for either a transformer or an AF deck assembly for an R-390, not A. Preferably in the UK or Europe to avoid high shipping costs, but anywhere in the world will be OK....
>
> Secondly does anyone know of a source of 3TF7's this side of the pond? I know they can be replaced / worked around reasonably easily, but I like to keep my receivers original, and could do with acquiring some at a reasonable price.
>
> Finally, and I know this is a question for the various R-390 groups out there, but I may as well ask. Does anyone know the cause of a parculiar fault I'm seeing on my Rx, whereby the receiver works perfectly with the BFO turned on, but the received audio all but disapears when it's turned off?
> It's not a big issue, but does not seem to make any sense as the BFO only inects a 455Khz signal into the mix, so removing the BFO signal should not affect the detector operation at all, but it does.
> I can still receive AM simply by zero beeting the BFO, but it's a strange fault, and I'm just wondering if anyone has seen it before.
>
> Thanks yet again for your help,
> Dave.S.
>
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