[Boatanchors] CG-512

[Barrie Smith]

> About all I can find is that the specs are the same as the PA-512 which
> is the standard version of yours. Still no connection info. However that
> model was around for several decades going back into the 30's.
>
> Perhaps Bunker of Doom has one catalog with info.  Or look in old
> Handbooks, thats a fairly standard line to PP grids item.
>
> Those measurements make no sense.
>
> Carl

Carl:

I just checked the resistances again using a different meter.  Same results.

Could I have a defective transformer?

73, Barrie, W7ALW
>
>
> ----- Original Message ----- 
> From: "Barrie Smith" <barrie at centric.net>
> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
> Sent: Friday, January 09, 2009 8:17 PM
> Subject: [Boatanchors] CG-512
>
>
> With 50, 200, and 500 Ohm primary taps to single choice PP grids an
> Ohmeter should determine whats what.
>
> Carl & All:
>
> The transformer has 5 pins on one side, numbered 1 through 5.
>
> I believe these pins are the primary side.  I would like to feed 600 ohm
> audio into the primary.
>
> If I start with pin 1, I read 2 ohms to pin 2 and 4 ohms to pin 3.
>
> There is no continuity between pins 1 through 3 to pins 4 and 5.
>
> Pins 4 to five show 2.5 ohms.
>
> The secondary has four pins, in two pairs.  One pin one each side is
> marked "F", the other pin on each side is marked "G".
>
> Each pair has continuity  One side is 66 ohms, and the other is 56 ohms.
>
> Since there iis no continuity between opposite pairs, I'm assuming that
> there are two separate windings that will achieve a center tap when the
> two pins that are marked "F" are tied together.
>
> Some modulation transformers are built this way.
>
> If I jumper the two "F" pins together, I get a reading of 121 ohms.
>
> Anyway, as I said, I'd like to feed 600 ohm audio into one side and
> drive a pair of 100THs with the other.
>
> Any help appreciated.
>
> 73, Barrie, W7ALW
>
>
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