Replacement 360/370 lamp LED holders

vrs vrs at
Wed Jun 28 21:19:58 CDT 2006

> > Does anyone know the specifications for the original bulbs?  Is there
> > a reason to expect that they (or an equivalent) are no longer made?
> I do not recall offhand, but the base and "cartridge" are fairly
> standard and not hard to get. The lens is a bit IBM specific (and of
> course, the bit everyone sees).

AFAIK, the key specs for a bulb are the base/style, the operating voltage
and current, and the "brightness" of the bulb.  Most of which could probably
be determined from a part number (if we're lucky) or with a bench supply
(if not).  (The brightness would probably also require a known reference
bulb or two to determine, though.)

I have some formulas around somewhere to derate brightness against voltage,
etc., which I've used before to determine which available (modern) bulbs
are the closest (if an exact equivalent can't be found).

Also, anecdotal evidence (from PDP-8/E panels) seems to indicate that the
values aren't even very critical.  (Several people have used the 8/I bulbs,
or other even more incorrect bulbs, and failed to notice the difference!)


More information about the cctech mailing list