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688

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ID = 41448
       
Country:
United States of America (USA)
Brand: Cunningham Inc., E.T.; Harrison (NJ)
Tube type:  Photocell Gas filled 
Identical to 688
First year 1932 Radio News Sep 1932

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament --/--
Description Peak sensitivity at 3500 Angström. 45 microamps-lumen. 
Dimensions (WHD)
incl. pins / tip
30 x 107 x mm / 1.18 x 4.21 x inch
Information source - - -   
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