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ID = 4117
United States of America (USA)
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to 1B5/25S
Similar Tubes
Other class quality (otherwise equal):
Other base and data slightly different:

Base 6-Pin-Base U6A, old, USA
Filament Vf 2 Volts / If 0.06 Ampere / Direct / Battery =
Description Glass type used as combined detector, amplifier, and avc tube in battery-operated receivers. 2 volts filament, 0.06 amperes. Typical operation as class A amplifier. The 1B5/25S is electrically similar to the 1H6G. 
Information source Essential Characteristics, GE 1973   

460_1.png 1B5/25S: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
1B5/25S: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector

More ...
Usage in Models 21= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of



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