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ID = 70075
United States of America (USA)
Brand: Mac Laren Manufacturing, Voltron (tubes); New York City (NY)
Tube type:  Triode, vacuum   Power/Output 
Identical to 7.5PR

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Battery =

Tube P-R 

Plate voltage: 425 V

Information source -- Original prospect or advert   Advert in Radio Broadcast Advertiser 1926

ux_base_standard~~232.png 7.5PR: Fin Stewart
Fin Stewart

Just Qvigstad

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