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Osram 215V 80W 4-pin Lamp Lit Here are three images of this lamp lit. The first is on the 35V setting, where just a small section of the filament is lit. Then the 215V setting, where the other larger section is lit. Finally, all the filament is lit on the 250V setting. The voltages used were slightly below the quoted values. Keywords: Lamps

Osram 215V 80W 4-pin Lamp Lit


Here are three images of this lamp lit. The first is on the 35V setting, where just a small section of the filament is lit. Then the 215V setting, where the other larger section is lit. Finally, all the filament is lit on the 250V setting. The voltages used were slightly below the quoted values.

DSC03095.JPG Tungstalite_200V_60W_Drawn_Tungsten_Lamp_2.jpg Osram_215V_80W_4-pin_Lamp_Lit.jpg Osram_215V_80W_4-pin_Lamp~0.jpg GE_120V_50-100-150W_Clear_Demonstration_Lamp.jpg
Lamp/Fixture Information
Manufacturer:Osram-GEC Ltd.
Model Reference:NATO 996-9602
Lamp
Lamp Type:Incandescent
Filament/Radiator Type:Drawn wire tungsten
Base:4-pin valve base
Shape/Finish:ST-78
Service Life:1000 hours
Burning Position:Vertical, base down
Electrical
Wattage:80
Voltage:35 / 215 / 250
Physical/Production
Factory Location:England (location unknown at present)
Fabrication Date:Not known at present (Date code 30VB)
Application/Use:Ships Navigation
File information
Filename:Osram_215V_80W_4-pin_Lamp_Lit.jpg
Album name:Ria / Incandescent Lamps
Keywords:Lamps
Filesize:136 KiB
Date added:28 May 2025
Dimensions:2098 x 921 pixels
Displayed:13 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=869
Favourites:Add to Favourites

Comment 1 to 12 of 12
Page: 1

Sammi   [Wed 28 May 2025 at 16:13]
Nice to get it lit and thanks to Max for telling us how to do it.! Love Bulb Man
Ria   [Wed 28 May 2025 at 16:16]
Indeed, a very useful person to know is our Max Love Cat
Max   [Thu 29 May 2025 at 14:30]
Good to finally see the lamp in operation Smile
Ria   [Thu 29 May 2025 at 18:42]
Thanks..! I managed to see the date code (with a lot of heavy breathing on the etch..!) and it says 30VB. I assume that 30 means June 1944 (or possibly 1936..?) but what does VB mean..? The factory location, perhaps Wonder
Max   [Thu 29 May 2025 at 19:19]
I doubt the lamp is from 1944 as NATO was created in 1949. As for the date code, it's possible that VB is the standard GEC letter code and 30 the manufacturing day (?). That would translate to February 1964, not impossible given how conservative the army and navy are (were) concerning the specification of their lamps. Otherwise, if we refer to the ELMA code system, the manufacturing date for "30" would likely be June 1952 or 1960.
Ria   [Thu 29 May 2025 at 23:10]
Hmmm. You said that on your lamp the date code was 33 and you thought it was 1944..? Ah but yours doesn't have the NATO code so maybe..? I'm still none the wiser Laughing
Sammi   [Thu 29 May 2025 at 23:56]
Max, I don't think that VB as February 1964 and the 30 as the manufacturing day would work... Wonder
Even though 1964 was a leap year it still only had 29 days... Razz
Max   [Fri 30 May 2025 at 21:30]
Yes, that's unlikely indeed, hence the second analysis in my previous comment.

Ria - Yes, my lamp has no NATO code, yours has one. So, it is most likely that mine was made before 1949 (creation of NATO) and your after. Moreover, mine has an older UX-4 end cap design than your.
Ria   [Fri 30 May 2025 at 23:55]
The cap on this lamp is quite a bit smaller than a UX-4, the 280W SOI/H is a UX-4 and it's a lot larger. Still, 1952 or 1960 is ok, no real way of telling which, though Wonder
Max   [Sat 31 May 2025 at 12:36]
Good point about the end cap.
Ria   [Sat 31 May 2025 at 13:07]
Not sure of the designation of this one, will have to look it up.
Sammi   [Mon 02 Jun 2025 at 14:40]
I've had a shufti, and the designation for the base is B4. Bulb Man

Comment 1 to 12 of 12
Page: 1