T3D Re: Projection Lamp 3-letter code (TECH-3D digest 542)

[bobh@xxxxxxxxxxxxxxxxxx]

RE: Ron laments confusion over specs of vast number of 3 letter 
code projection lamps and says "Why don't they do it like radio 
and TV tubes?" This got my attention as I was the engineer that 
suggested the three letter codes in ASA meetings, so we could 
pick a lamp as easy as a 6J6 radio tube!!!!
It was eventually adopted and were ASA listed (now ANSII codes). 
Before THEN one had to order a lamp by filament, base, bulb 
shape, and diameter as well as wattage and voltage (in 5 volt 
steps).
e.g  1000 watt, 120v T-12, med. pref. base C-13D filament.
 T-12 was tubular 12/8th inch diameter, Med Prefocus base was 
keyed twin ears (vs B&H or bayonet in smaller lamps) C-13 D was 
Coiled filament in 13 rows double layered i.e 6 and 7 lined up to fill 
the space. So the 3 letter code made it easy to find just the right 
one by looking at code on old one.
 I have been away many years (1955) from Westinghouse Lamp 
Division (now owned by NORELCO). But I see the problem as not 
having a list of lamps. Makers used to put out lamp catalogs for 
projectors etc. and ANSI should have a list of the 3 letter codes 
and what they mean. I will take a search engine look to see if I can 
find ANSI lamp codes. BobH 
(the main thing in fitting old type lamps as in stereo projectors was 
wattage rating in line with cooling and size of lamp house and fan 
air flow AND that base and filament position matched optics.)
Bob Howard (bobh@xxxxxxxxxxxxxxxxxx)
SEND NO PIX OR PROGRAMS TO LIGHTSIDE!!
 Instead send those to:
robhoward@xxxxxxxxxxx  or   bobh626@xxxxxxxxxxx