On Nov 24, 21:22, Ethan Dicks wrote:
>
> --- ajp166 <ajp166_at_bellatlantic.net> wrote:
> > From: Ben Franchuk <bfranchuk_at_jetnet.ab.ca>
> > >What about using white leds?
> > >Ben Franchuk.
> >
> > Why? Back then when the led mod was common red was the only
> > available visible color for leds. White leds are a bit blue rich
though
> > they would work. One point is that there are some 28 or so leds/lamps
> > and good ones will not be cheap and cleap ones will not be good.
Agreed. The LEDS are water-white plastic, but red-emitting. Each has its
leads cut short, about 1/8" from the body, and a small 430R resistor
soldered to the cathode and a wire (probably the trimmed-off resistor lead)
to the anode. (Is this what some people have described as an "LED module"
or is that something more substantial?) They then fit into the bi-pin lamp
sockets. The resistors look like modern miniature metal film, but could be
20 years old.
Similar red LEDs cost pennies, maybe 10p. 25p - 35p with integral
resistor. Bi-pin bulbs of about the right voltage/current/intensity cost a
bit more, about 50p each here. I did think about white LEDs, but they cost
over ?3 each. As Allison says, I would need 28 (plus a bag of spares if I
use lamps) and white LEDs give off a very cold bluish light, quite unlike
the slightly yellow lamps. I thought about yellow LEDs, but they're much
*too* yellow. Then I thought about pairs of LEDs, but that's just getting
too silly.
> At about $3/each, yes they are expensive, but only slightly more
expensive
> than real DEC lamps. Personally, I'd go with either red LEDs or bulbs,
> since that's what's appropriate for the period.
I think I'll stick with the existing LEDs and maybe "save up my pocket
money" to buy 40 or so bulbs (28 plus a dozen spares).
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sun Nov 25 2001 - 06:11:21 GMT