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4020A

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ID = 13606
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to 4020A = CV1664 = SY4020A = AR12 = R87 = 3A/108A = 4631
Similar Tubes
Normally replaceable-slightly different:
  TB-601-A
Other class quality (otherwise equal):
  CV1310
Heater different:
  4102D
Other base:
  S4020A ; S4020B
Base UV-Base (4 Pins+Bayonet, USA 1914 WE) (Codex=Bo)
Was used by Telephony
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =
Description

Telephone repeater tube designed for DC series or parallel operation.

 
Dimensions (WHD)
incl. pins / tip		 57 x 114 x mm / 2.24 x 4.49 x inch
Weight 65 g / 2.29 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Saga of the Vacuum Tube, Tyne   p.469
- - Manufacturers Literature
uv~~7.png 4020A: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1925?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of

David Pfister (CH)
Aldo Patriarca (CH)
Patrice Zeissloff (F)
Rudolf Osterkamp (D)
 
4020a.jpg

4020A
 
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