That helps some. Those are called 'slide base' bulbs. They came in
several different lengths, and ratings. They were used by the millions
in such things as Western Electric, telephone equipment, including
switch boards. I do have some here. Still need a number, or length and
voltage, or a working sample.
Ira.
On 12/18/2025 8:41 AM, Mac Doktor wrote:
On Dec 18, 2025, at 10:52 AM, Tom Katt <[email protected]> wrote:
On Thursday, December 18, 2025 at 10:45:26 AM UTC-5 Instrument
Resources of America wrote:
What's the part number on the bulbs? If no part number, how about
a good photo with a scale for dimensions, and any electrical
specs if known.
My recollection is that the bulbs were small 12V or 24V with a
threaded base, but I may be wrong.
The "bulbs" are long and polygonal with contacts running down the
sides. They slide in and out of the switch.
I do remember trying to locate additional switch assemblies and they
were all but impossible to find at the time. I'll poke around Google
images to see if anything kindles those memory cells..
Good luck with that one. Rare on eBay and usually expensive.
Terry Bowman, KA4HJH
"The Mac Doctor"
https://www.astarcloseup.com
“...the book said something astonishing, a very big thought. The
stars, it said, were suns but very far away. The Sun was a star but
close up.”—Carl Sagan, "The Backbone Of Night",/Cosmos/, 1980
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