8mm Forum: 30 year old Projection Bulb

This is topic 30 year old Projection Bulb in forum 8mm Forum at 8mm Forum.

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Posted by Thomas Dafnides (Member # 1851) on July 26, 2010, 09:41 PM:

When you buy a 30 year old unused projection bulb with an intact filament that will not light (contact cleaned)...what has happened....vacuum seal gone?

Posted by Alexander Lechner (Member # 1548) on July 27, 2010, 01:06 AM:

Happened to me as well. The only explanation would be that the wire inside the cement (between connection pins and filament) is not intact anymore.

Posted by Simon McConway (Member # 219) on July 27, 2010, 03:29 AM:

What lamp is it (type)?

Posted by Adrian Winchester (Member # 248) on July 27, 2010, 11:44 AM:

Unlikely to be the explanation, but if the pins are extremely tarnished, you could try cleaning them with a sharp knife or emery paper, etc.

Posted by Pasquale DAlessio (Member # 2052) on July 27, 2010, 01:29 PM:

If the vaccum seal was gone the bulb would have flashed when turned on and you would see a burnt filament.

Posted by Tony Stucchio (Member # 519) on July 27, 2010, 07:51 PM:

I have the same issue -- an Elmo EFR that came with a projector I got last year. It is not burnt out -- I just can't throw it away even though it won't light up. I've cleaned the pins with some alcohol to remove the blackness but no luck.

Posted by Thomas Dafnides (Member # 1851) on July 27, 2010, 08:01 PM:

The bulb is an incandescent CXL...it would not light up in one projector which had a working bulb....but when I tried it another projector it did light. (Just made a note on its box).
The one projector has a cleaner contact (it looks less tarnished) ?

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