23 Oct
2009
23 Oct
'09
9:40 a.m.
And broken indicator lights. Does anybody have
experience replacing
those bulbs? Originally there are those white plastic blocks that
should be replaced as one piece. Nice idea - I have ONE complete
replacement and at least 6 to repair.
That prompted an interesting line of research. Those are apparently
DEC part number 12-09637, which in turn is a "Line-o-Lite" 3590A20.
Here's a picture of one, but they are sold out:
http://www.surplusshed.com/pages/item/m2255.html
http://www.surplusshed.com/photo.cfm?ID=M2255_1
They are a 12V indicator assembly made by Industrial Devices, Inc.
I haven't found a supplier for them yet. Looks like the newer
rectangular indicators are all smaller.
Those blocks are easily opened, fiddling a new
lamp inside is easy and no problem. So what I ask you is only for ideas
about the right lamps to use. It should look similar to the original
lamps (or could be a bit brighter).
Since the series resistor is 15 ohms, 1/4 watt, we can infer a maximum
current of about 100ma for the bulb. More than that would run the
resistor way too hot. I'd probably look for something in the 12-15V
range with a 60ma or less current draw (<=1W), and the desired brightness.
Vince