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ID = 15690
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Transmitting Triode, air cooled   VHF 
  Ca. 1925 up to 1945 rare.
Identical to CV1288 = TY1-50 = NT58 = 4889 = VT121A_GPO = DET12 = CV1235
Similar Tubes
Normally replaceable-slightly different:
  4304CB ; CV1062 ; CV315
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Ex) 2 Top contacts
Was used by Military and/or Government
Filament Vf 7.5 Volts / If 3.2 Ampere / Direct / Parallel / series AC/DC

VHF transmitting triode. 50W max plate dissipation, 100MHz full ratings operating frequency. Thoriated tungsten filament.

Dimensions (WHD)
incl. pins / tip
58 x 175 x mm / 2.28 x 6.89 x inch
Literature Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   
Rudolf Osterkamp

CV1288: Manufacturer's Literature
Emilio Ciardiello

CV1288: Manufacturer's Literature
Emilio Ciardiello

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