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Topic: What is a tungar bulb and its use?
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Kenneth Wuepper
Phenomenal Film Handler
![](/ubbmembers/1174e.jpg)
Posts: 1026
From: Saginaw, MI, USA
Registered: Feb 2002
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posted 07-23-2002 06:44 AM
OK, time for a 'historic' use of the Tungar bulb rectifier...Used in the projction room end of the theatre where two bulbs provided full wave rectification for the 'field coils in the stage loudspeakers'. Field coils were the pre-cursor to permanent magnets on the back of loudspeakers. Both the bass speakers and the horn drivers were powered by DC of the 12 to 20 volt type. When one Tungar burned out, you got a lot of "HUMMmmmmm" in the system. Even with the amplifiers off When used to power the sound exciter lamps, the power supplies contained 2 Tungar bulbs and 20 or 30 oil filled capacitors of 10 microfarad capacity. That oil could leak out and the fumes were sickening. That was over 50 years ago. Seems like yesterday.
KEN
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