WTB: DEC PC04 Paper Tape Reader/Punch
vrs at msn.com
Mon Aug 18 18:45:50 CDT 2008
From: "Ethan Dicks" <ethan.dicks at usap.gov>
> On Mon, Aug 18, 2008 at 10:55:14AM -0700, Vincent Slyngstad wrote:
>> Isn't it basically exactly an old-school 6V automotive dome light?
> It was a dome light, but I'm not certain about the voltage right now.
> It's entirely possible it's a 6V bulb derated to 5V, but I'm not sure.
I did check that it's being run from +5V through a 2 ohm 10W potentiometer.
So I thought a 6V automotive dome light would be about right.
> The best I recall is finding an Osram part number _somewhere_, but
> not being able to find that bulb in their modern catalog and no
>> If it's DEC part number 12-04903, then that's available here:
If you have the Osram part number, we can check that it is or is not the
12-04903, which is Osram #6411. That's the lowest voltage Osram bulb I
found referenced in the 9/1/70 version of the DEC Spare Parts Reference,
Volume II, section 12 (purchased vendor items). The thing that is fishy
about it is that it seems to be a 12V bulb. The drawings clearly show
the bulb being driven from +5V, so it seems that a 12V bulb would have
been serious overkill for that application. Maybe that's why they
thought they'd never need replacement :-).
More information about the cctech