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ID = 27434
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Vacuum Pentode   Power/Output 
Identical to B443_4pin = RES174d = PT415 = 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:
Other base:
  425PT ; B443 ; B443_UX4pin ; LL415 ; ME4_362 ; TU415 ; W443
First Source (s)
Sep.1927 : - - Manufacturers Literature
Successor Tubes 1928   RES164d  

Base Europe 4-Pin B4 + side contact
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Specified voltage AC/DC

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)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Hartmut Völler

More ...
B443_4pin: RPG Funke
Wolfgang Holtmann

B443_4pin: own collection
Peter den Boer

More ...

from Just Qvigstad

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

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):9

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