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B443_4pin

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ID = 27434
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Vacuum Pentode   Power/Output 
Identical to B443_4pin = RES174d = PT415 = LL415 = R79 = RO4243 = T60_Adzam_4pin = TB43 = TL414 = 415QD_4pin = 415PT_4pin = 415PP_4pin = 410PT = 4GBF = L416D_4pin = W443_4pin = PM24 = PP415_4pin = TU415_4pin
Similar Tubes
Normally replaceable-slightly different:
  D100_4pin ; L43
Different connections:
  B443_3SC
Other base:
  425PT ; B443 ; B443_UX4pin ; ME4_362 ; TU415 ; W443
First Source (s)
Sep.1927 : - - Manufacturers Literature
Successor Tubes 1928   RES164d  

Base Europe 4-Pin (A, 4A, B4, since 1914) Sidecontact
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Parallel, (AC/DC) /
Description First output pentode, on market Sept. 1927
Equivalent types: RES174d (Telefunken), L415D (Valvo), PP415 (Tungsram)
Successors: B443S, L416D, RES164
The B443 is the first produced output pentode of the world, introduced by Philips in September 1927. It's amplification and its power output was much higher as with an output triode of equal size. The B443 has established the replacement of output triodes by multiple-grid output tubes. The equivalent Telefunken type RES174d appeared in 1931.
[Jacob Roschÿ, 2003-Jan-14] 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
b443_7.jpg
B443_4pin
Hartmut Völler

 
tubesockel_klein_b443.gif
B443_4pin: RPG Funke
Wolfgang Holtmann

 
b443-4pin-data1.png
B443_4pin: own collection
Peter den Boer


Usage in Models 2= 1928 ; 1= 1929 ; 3= 1930?? ; 1= 1940

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):7


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