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.
Ira.
On 12/18/2025 5:04 AM, Tom Katt wrote:
On Wednesday, December 17, 2025 at 2:29:51 PM UTC-5 Mac Doktor wrote:
Oh, the humanity. Mine is intact and running.
https://www.astarcloseup.com/2019/05/systron-donner-8350-readergenerator.html
Someone is fixing the broken switch caps for me.
I loved the nasa-style illuminated push buttons and thumbwheel
switches for setting the time.
That's the rare part. The prongs on a couple of mine broke. I need
to contact Sam to see if he's settled in for the winter and can
fix them. Does anyone know where to obtain the light bulbs in
them? I do NOT want LEDs in there.
On Dec 17, 2025, at 2:16 PM, Leroy Jones wrote:
What all does "Colossus" do?
"This is the voice of World Control."
"Man is his own worst enemy."
My favourite evil computer movie ;-)
When I bought that Systron Donner timer in the 90's gear like that was
all over the place and basically being sold for gold scrap. I had
always loved nixies since I was a kid and my father's friend worked at
Burroughs - I got to visit his office a few times and play with the
punch card terminals... That was where I first saw the neon tubes and
it was burned into my memory. Later when I had the resources to build
a clock for myself the easiest thing to do was just get something
already functioning because I had no idea how to wire them. In
hindsight, I would have preferred to have saved the original gear...
but such is life and at least the boards live on. Speaking of which -
I had never neard of DTL (Diode-Transistor-Logic) until I started
reverse engineering the circuits - they looked like TTL chips, but
were a generation prior technology. Interesting.
And yes - there is a place for LED's, but it's not in those switches!
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