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ID = 83572
United States of America (USA)
Brand: Electronic Enterprises Inc.; Newark, NJ
Developer: Electronic Enterprises Inc.; Newark, NJ 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 866EA
Similar Tubes
Differences not known by us:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial
Filament Vf 2.5 Volts / If 5 Ampere / Direct

According to "Tube Lore II", page 80, this tube is a variant of the 866A and first made in 1969. No details of the variation are shown.

Information source Tube Lore (II)   p. 80

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