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ID = 17718
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Triode, vacuum   VHF 
Identical to DET20
Similar Tubes
Normally replaceable-slightly different:

Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Transmittertube (Radio)
Filament Vf 6.3 Volts / If 0.17 Ampere / Indirect / Specified voltage AC/DC

Horned triode with separate anode and grid top caps.
Meets the CV6 specification with a slightly lower heater current.
Classified as a transmitter tube (DET = Dull Emitter Transmitter), it was also used as a local oscillator.

Information source Babani, International Radio Tube Encyclopaedia   p. 198 & 199
-- Original-techn. papers.   
The Saga of Marconi Osram Valve
Taschenbuch zum Röhren-Codex 1948/49

det20_sockel.png DET20: Beier 2, 1957
Anonymous 384 Collector

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Just Qvigstad
DET20: GEC's catalogue supplement
Anonymous 413 Collector

Collection of

Collection of a member from D


Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 1878     Replies: 1
DET20 (DET20) UHF-Sende-Triode
Dietmar Rudolph † 6.1.22
  1 Daten gemäß Beier 2, 1957:
Uf = 6,3V If = 0,17A (bei Beier ist ein Druckfehler: Uf = 0,3 V; Das kann nicht stimmen, da der Kaltwiderstand des Heizfadens ca. 18 Ω beträgt.)
Ua = 300V, Ia = 25 mA, S = 3mS, Ra = 8,3 kΩ, Na =3,5W, ce = 1pF, ca = 1pF, cg/a = 2,1 pF

Roy Johnson

6.3V at 0.17A is correct. 

The CV6 specification is for 0.2A (or less) and the DET20 meets this specification.  The equivalence has been changed to "normally replaceable".

Thank you, regards,



End of forum contributions about this tube

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