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SF8

 
    
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The SF8 or SF.8 is a photographic flash tube. As yet we have found no specific details, but this type of flash was used for high speed photography and used a high voltage to generate a brief pulse of intense light as short as 1 μS in some cases. Modern studio flash units use a much lower voltage to produce pulses of a milli-second or so. See also LSD3.
Through the frosted diffuser envelope the helical glass tube can be seen together with the lead.
The wide glass tube envelope is 30 mm in diameter and, excluding the UX4 base pins, is 87 mm tall.
Reference: Observation.

 

Updated June 19, 2020.
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