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ID = 58086
Great Britain (UK)
Brand: PR (P.R.) Products; London
Tube type:  Triode, vacuum   Audio Frequency 
Identical to GPR4
First Source (s)
1929 : - - Manufacturers Literature

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.35 Ampere / Direct / Battery =

For RC audio coupling.

Some confusion surrounds the type number prefix of P. R. tubes. Some tubes located have a paper label stating GPR--, for example the GPR3 and GPR4, Wireless World, October 9, 1929 shows the prefix of all tubes as GPR, while Wireless World November 27, 1929 shows tubes prexixed as PR--. ,   

Information source Wireless World (The), London (WW, 79)   October 9, 1929 & November 27, 1929

b4_base_pins~~304.png GPR4: Fin Stewart
Fin Stewart

Just Qvigstad

Collection of



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