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UBL21

Information - Help 
ID = 287
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Double Diode-Pentode   Power/Output 
Identical to UBL21 = UBL71
Similar Tubes
Normally replaceable-slightly different:
  UBL21(N)
Other base and data slightly different:
  UBL1 ; UBL3
Multiple differences or of other kind:
  CABL21
First year Feb.1941 Tube leaflet collection E.Erb Analysis by original leaflets (P11)
First Source (s)
May.1941 : Radio-Mentor # 5
Feb.1941 : Philips-Buch III
Predecessor Tubes CBL1   UBL1   CBL6   CABL21  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wa)
Was used by Radio/TV-reception etc.
Filament Vf 55 Volts / If 0.1 Ampere / Indirect / Series, AC/DC
Tube prices 32 Tube prices (visible for members only)
Literature Philips Bulletin   Juli 1941
Taschenbuch zum Röhren-Codex 1948/49   
  ubl21.png
  UBL21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
 
ubl21_a.jpg
UBL21: scc
Christian Schaufelberger

 
ubl21_sock.png
UBL21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

 
ubl21_mullard_data_01.png
UBL21: Mullard - original papers
Wolfgang Romeyke


Usage in Models 7= 1941?? ; 4= 1941? ; 70= 1941 ; 3= 1942?? ; 1= 1942? ; 53= 1942 ; 3= 1943?? ; 14= 1943? ; 42= 1943 ; 3= 1944? ; 55= 1944 ; 4= 1945?? ; 7= 1945? ; 44= 1945 ; 4= 1946?? ; 8= 1946? ; 44= 1946 ; 5= 1947?? ; 10= 1947? ; 37= 1947 ; 10= 1948?? ; 15= 1948? ; 56= 1948 ; 7= 1949?? ; 12= 1949? ; 61= 1949 ; 7= 1950?? ; 7= 1950? ; 32= 1950 ; 3= 1951?? ; 3= 1951? ; 26= 1951 ; 2= 1952?? ; 2= 1952? ; 27= 1952 ; 4= 1953?? ; 4= 1953? ; 9= 1953 ; 3= 1954?? ; 1= 1954? ; 10= 1954 ; 5= 1955?? ; 3= 1955? ; 4= 1955 ; 1= 1956?? ; 1= 1956? ; 6= 1956 ; 3= 1957? ; 8= 1957 ; 2= 1958? ; 2= 1958 ; 3= 1959 ; 1= 1960 ; 2= 1962? ; 1= 1970?? ; 2= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):763


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