29 Jan
2002
29 Jan
'02
12:10 p.m.
On Jan 29, 6:22, Ethan Dicks wrote:
The bulbs in RL02s aren't "wire-ended", they're 14 volt T1_1/2
"wedge base"
bulbs. Wedge base bulbs are common in motor vehicles. Unfortunately 14V
is hard to get (except in T1_3/4 size), but I used 12V ones in my RL02s --
they're just a bit brighter. Farnell part no 328-960, made by SLI (for
whom someone posted a URL). I got some low-current 12V ones made by VCH as
well.
my
Dunno about bulbs for a PDP-8 but spare RL01/2 bulbs I got from DEC are
definitely 14V.
--
Pete Peter Turnbull
Network Manager
University of York
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 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.