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ID = 21292
United States of America (USA)
Brand: Speed, Cable Radio Tube Corp. / Cable Supply Co.; New York and Brooklyn, NY
Tube type:  MULTI-SYSTEM, internal coupling   Power/Output 
Identical to 293
Similar Tubes
Heater different:
  291 ; 295
Other base:
Other base and other heater:
  291_6pin ; 295_6pin
Successor Tubes 6B5  

Base UY-Base, 5 Pins (USA, April 1927) Top contact with a cap.
Filament Vf 6.3 Volts / If 0.6 Ampere
Description There is also a 6pin version in literature. But the basing diagrams for that version are somehow erroneous in different ways. Only the 5pin data in Babani appear conclusive and convincing. And the picture seen at the 295 shows a 5pin tube as well. 
Text in other languages (may differ)
Information source Babani, International Radio Tube Encyclopaedia   

293_5pin_sock.png 293: Babani
Anonymous 15 Collector

Just Qvigstad
293: Grundig Rö-Tabu, zum M1, Band 3, 1948
Anonymous 15 Collector

Collection of



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