[Milsurplus] Western Electric 13P Resistance Lamp

[Dave Merrill]

I think you nailed it, Brian. Thanks for the research.

Dave N9ZC

On Sun, Apr 9, 2023, 10:08 PM Brian Harrison <briankn4r at gmail.com> wrote:

> Hi Dave,
>
> Western Electric 13B lamps?
> <https://sundance-communications.com/forum/ubbthreads.php/topics/543920/Western_Electric_13B_lamps>
> sundance-communications.com
> <https://sundance-communications.com/forum/ubbthreads.php/topics/543920/Western_Electric_13B_lamps>
> [image: favicon.ico]
> <https://sundance-communications.com/forum/ubbthreads.php/topics/543920/Western_Electric_13B_lamps>
> <https://sundance-communications.com/forum/ubbthreads.php/topics/543920/Western_Electric_13B_lamps>
>
>
> They are called resistance lamps (sometimes called ballast lamps) and they
> are inserted in series with ringing supply leads (manual or machine) so
> that when a called phone goes off-hook during the ringing cadence, a short
> circuit is not presented across the ringing supply.
>
> The ones in your photos were probably from a small manual or automatic PBX
> installation, and they are mounted in type 105 boxes. The ones on my 701
> PBX are mounted on a 23" plate above the ringing machines.
>
> The earlier ones had screw bases, and the later ones had solder lugs in
> Bakelite (or some other kind of black plastic) bases.
>
> Type 12 <https://www.kadiak.org/tel/res_lamp12.html>
>
> Type 13 <https://www.kadiak.org/tel/res_lamp13.html>
>
> best,
> brian
> kn4r
>
> On Apr 9, 2023, at 6:51 PM, Dave Merrill <r390a.urr at gmail.com> wrote:
>
> Anyone know what this is for? Some kind of ballast tube, made in 1963.
> Searching the FSN came up empty
>
> Dave N9ZC
>
> https://photos.app.goo.gl/Zaci4YtM6QNDaQWf7
>
>
>
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