[AMRadio] RCA Transformer ID?


ars.w5omr at gmail.com ars.w5omr at gmail.com
Sat Jul 15 08:26:50 EDT 2017


I believe that was a winding to modulate the screens of say an 813, or a 4-125/250/400

On Jul 15, 2017 5:53 AM, Rob Atkinson <ranchorobbo at gmail.com> wrote:
>
> That should certainly help with the audio frequency response.  I can't
> remember if they have a core gap or not.  I bet they have one.  I
> heard that RCA made a zillion of them and they were frequently found
> at hamfests 50 years ago.   I don't know what kind of final PA was in
> the Liberty ship rigs.  Must have been some sort of tetrode because of
> the tertiary winding, or else maybe the 3rd winding was used to
> modulate the driver.
>
> 73
>
> Rob
> K5UJ
>
> On Fri, Jul 14, 2017 at 10:24 PM, ARS W5OMR <ars.w5omr at gmail.com> wrote:
> > Rca 1:1 mod xfmr.
> > Secondary good for 200mA.
> > I believe these were used on the Liberty ships using modulated CW.
> >
> > I ran a pair of 250TH's on one, with a capacitor coupled reactor choke to
> > shunt the DC off of the secondary.
> >
> > W5OMR


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