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ID = 84008
United States of America (USA)
Tube type:  Screen-grid Tetrode   Audio Frequency 
Identical to 1B4T
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.06 Ampere / Direct
Information source - - Manufacturers Literature   Canadian Marconi price list July 1939
Babani, International Radio Tube Encyclopaedia   p. 2 & 3

441_1~~1.png 1B4T: Fin Stewart
Fin Stewart

Just Qvigstad

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