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ID = 57722
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Triode, vacuum 
Identical to A577

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Technology / Measurement
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Voltmeter triode.

Va <250, 2.0mA/V Z=3000 ohm.

Information source - - Manufacturers Literature   

A577: Osram DataSheet
Franz Scharner

a577_sockel.gif A577: DataSheet
Franz Scharner

Just Qvigstad
A577: Osram DataSheet
Franz Scharner

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