Searching for old DEC 12V frontpanel bulbs

From: Ethan Dicks <>
Date: Tue Jan 29 08:22:28 2002

--- Pete Turnbull <> wrote:
> At 05:53 AM 1/28/02 -0800, Ethan wrote:
> > I'm restoring some pre-TTL DEC stuff (R and W series logic) and I need
> > a handful of front panel bulbs.
> Sounds like a standard T1_1/2 (about 3/16" diameter) or T1_3/4 (about
> 1/4" diameter) wire-ended bulb. There are still a few companies that
> make them.

If I had to guess, I'd go with the 1/4" diameter. These are larger
than PDP-8/L or RL01/RL02 bulbs.

> > If DEC was underfeeding these bulbs to extend their life, I would
> > expect that the bulb should be rated at 14V-16V.

> The Farnell catalogue lists a few that are 14V. The correct bulbs for my
> RL02 drives are 14V, fed from a 12V supply, as you say.

>From a conversation with Jeff Russ, a PDP collector from Indiana, it
seems that the bulbs are 28V, underfed to 12V-14V. He found some
similar bulbs at a hamefest once, but they drew double the current
of the originals.
> > I have checked the online manuals I could find, but no mention is made
> > of the nature of the bulbs for 1966/1967-era DEC equipment. Any ideas?
> Take a look at Farnell's online catalogue...

Nice tip. Thanks. I'll look for them there.


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Received on Tue Jan 29 2002 - 08:22:28 GMT

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