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W443_4pin

Country:  Netherlands      Brand:  Longlife, the Hague 
  Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Tube ID = 21043
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Identical to W443_4pin = RES174d = B443_4pin
Similar Tubes Other base:
 W443
Production stop   Feb.1938
Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If: 0.15 Ampere / -: Direct / -: Battery = /
Description The "Röhren-codex" lists this tube as a Thermion tube, but the brand is Longlife. The type on the picture is a Longlife Superior type W443. 
Literature - - Manufacturers Literature   Sept. 1935

w443superior.jpg
W443_4pin
Peter den Boer
 
w4434pin_so.png
W443_4pin: rtt
Michael Schlör
 
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