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ID = 52457
Great Britain (UK)
Brand: Quadruple Valve Co., Ltd., Nottingham
Developer: Quadruple Valve Co., Ltd., Nottingham 
Tube type:  Quad Triode   Universal 
  Late but very rare. ***
Identical to Four-In-One
First year 1929 Tube Collector, June 2011, page 13.

Base SPECIAL TUBEBASE in general
Filament If 0.5 Ampere / Direct / Battery =

Quadruple Valve Co., Ltd., Nottingham has built the "Four-in one" valve in 1929. There were found two versions, one with the 4 horizontal triodes mounted in parallel as shown in the patent GB 280,258 and the other in a square formation. They have a total plate current of 8 mA at 80 - 120 V. A scaled-down version with three triodes is also known. See "Tube Collector" 13/3, June 2011 on page 13 with further references - also to pictures. See also the German "Polytron-4fach" from 1927 (Dr. G.O. Spanner GmbH). There are 12 pins on this tube but connections are not known.

Tube prices 1 Tube prices (visible for members only)
Information source -- Collector info (Sammler)   BVWS bulletin vol. 24, no 1, 1999

Four-In-One: Retro Radio 2015 Dezember Nr.4
Rudolf Osterkamp

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