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ID = 77053
Great Britain (UK)
Brand: Midgetron, Park Royal Scientific Instruments Ltd.; London
Developer: Midgetron, Park Royal Scientific Instruments Ltd.; London 
Tube type:  Vacuum Pentode   Audio Frequency 
Identical to 501_Midgetron
First Source (s)
Sep.1946 : The Wireless World, London (WW, 79)

Base Subminiatur (wire-ends, flat) B5A
Was used by Radio/TV-reception etc.
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =

Miniature valve designed for radio and hearing aid use.

Literature Universal Vade-Mecum, Electron Valves and Semiconductor Devices   1950
The Wireless World, London (WW, 79)   September 1946

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