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DF91

Information - Help 
ID = 434
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to DF91 = 1T4 = W17 = 1K2 = 1F3
First year Jun.1947 Trader Service Sheet (suppl. of Wireless & El. Trader, etc.) December 13th 1947
First Source (s)
Mar.1948 : Funkschau # 3

Base Miniatur-7-Pin-Base B7G, USA 1940 (Codex=Zoo)
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery = /
Description HF-Regelpentode, ab 1950 in Deutschland. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
19 x 54 x mm / 0.75 x 2.13 x inch
Weight 10 g / 0.35 oz
Tube prices 6 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   

  df91.png
  DF91: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
df91_a.jpg
DF91: scc
Christian Schaufelberger

 
df91_sockel.png
DF91: Telefunken Handb. d. Rundfunkröhren
Peter Hoddow

 
df91_kennlinie.png
DF91: Ratheiser RTH,3.Aufl.,1964
Egon Penker


Usage in Models 8= 1947 ; 1= 1948?? ; 4= 1948? ; 10= 1948 ; 3= 1949? ; 35= 1949 ; 6= 1950?? ; 14= 1950? ; 44= 1950 ; 5= 1951?? ; 4= 1951? ; 54= 1951 ; 14= 1952?? ; 28= 1952? ; 81= 1952 ; 4= 1953?? ; 23= 1953? ; 77= 1953 ; 5= 1954?? ; 7= 1954? ; 31= 1954 ; 9= 1955?? ; 5= 1955? ; 18= 1955 ; 2= 1956?? ; 2= 1956? ; 16= 1956 ; 2= 1957?? ; 5= 1957 ; 1= 1958?? ; 1= 1958? ; 5= 1958 ; 1= 1959? ; 1= 1962?? ; 2= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):528



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