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ID = 84658
Great Britain (UK)
Brand: British Pix Co., Ltd., The; London
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to AC4VM

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect

This tube made in Europe for the company.

Information source -- Collector info (Sammler)   

b5_9_10~~11.png AC4VM: Fin Stewart
Fin Stewart

Just Qvigstad

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