[Milsurplus] Western Electric 13P Resistance Lamp

[Dave Merrill]

Maybe I should have been more specific. What ~equipment~ was it used in?
As Jeff, N2LXM, points out, it could have been used in an Audio
Oscillator.  For example, the TS-382 Audio Oscillator has a 3 Watt
incandescent bulb (R115) in the cathode of the V101 oscillator. IIRC, some
HP audio oscillator like the 200s incorporated incandescent bulbs for the
same purpose.

I sure know about 3TF7s!  No shortage of R-390s around here.

Dave N9ZC

On Mon, Apr 10, 2023, 9:48 AM Mike Feher <n4fs at eozinc.com> wrote:

> Hi Dave – It says it right on the box. It is a current regulator. They
> were often used in series with a tubes filament to maintain a constant
> current. Think of the 3TF7 in the R390A. 73 – Mike
>
>
>
> Mike B. Feher, N4FS
>
> 89 Arnold Blvd.
>
> Howell NJ 07731
>
> 848-245-9115
>
>
>
> *From:* milsurplus-bounces at mailman.qth.net <
> milsurplus-bounces at mailman.qth.net> *On Behalf Of *Dave Merrill
> *Sent:* Sunday, April 9, 2023 6:51 PM
> *To:* Military Surplus net List <milsurplus at mailman.qth.net>
> *Subject:* [Milsurplus] Western Electric 13P Resistance Lamp
>
>
>
> 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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