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25L6GT

Information - Help 
ID = 2964
       
Country:
United States of America (USA)
Brand:
Tube type:  Beam Power Tube   Power/Output 
Identical to 25L6GT = VT-201C = 25L6GT/G
Similar Tubes
Other shape (e.g. bulb type):
  25L6 ; 25L6G
Other class quality (otherwise equal):
  1677 ; 6046 ; CV553
Heater different:
  12L6GT ; 50L6GT
First year 11.Apr.1938 Electron Tube Registration List see also Wikipedia 25L6
Predecessor Tubes 25A6   43  
Successor Tubes 50A5   25EH5   25L6GT/G  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Udb)
Was used by Radio/TV-reception etc.
Filament Vf 25 Volts / If 0.3 Ampere / Indirect / Series, AC/DC
Description

The octal-based (EIA base 7AC) beam power tetrode 25L6 was mainly used for the "All American Five" type radios, in short "AA5" sets abut also in a number of early computers, like the UNIVAC I (1952) from Remington Rand (later called Sperry Rand and then Unisys). The UNIVAC I used about 5200 vacuum tubes. The tube type 6046 is the industrial type of the 25L6GT, used as a relay driver or to run selenoids in key punch machines.

The 25L6 was introduced as a metal tube November 4, 1936, but most examples of this family were glass types 25L6G or 25L6GT. The ST14 glass tube 25L6G started March 30, 1937. The T9 size GT version arrived the market April 11, 1938. There was also a 25L6G in the smaller ST-12 glass envelope.

The 25L6 is identical in design and ratings with the 50L6 except haveng a 25 volt 300 mA heater instead of a 50 volt 150 mA heater. The 12L6 and an identical 12W6 were made with a 12.6 volt, 600 mA heater, and the 6W6 was made with a 6.3V, 1200 mA heater. A bit different (slightly lower-powered heater) is the otherwise same 35L6, but the 6L6 with the same basing diagram is not of this family and has more than twice the power capability of the family.

 
Tube prices 3 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  25l6gtschaltung.png
  25L6GT: U.G.
Urs Gloor
 
25l6gt_029r.jpg
25L6GT
Jacob Roschy

 
oc33_g_29.gif
25L6GT: RTT Schwandt
Günther Stabe

 
25l6gt_techdat01.png
25L6GT: Sylvania Technical Manual
Peter Hoddow


Usage in Models 2= 1938?? ; 4= 1938? ; 22= 1938 ; 13= 1939?? ; 55= 1939? ; 100= 1939 ; 9= 1940?? ; 34= 1940? ; 47= 1940 ; 12= 1941?? ; 4= 1941? ; 23= 1941 ; 5= 1942?? ; 17= 1942? ; 11= 1942 ; 1= 1943? ; 1= 1944? ; 3= 1944 ; 5= 1945?? ; 4= 1946?? ; 18= 1946 ; 13= 1947?? ; 3= 1947? ; 13= 1947 ; 2= 1948?? ; 11= 1948? ; 30= 1948 ; 3= 1949? ; 30= 1949 ; 5= 1950?? ; 28= 1950? ; 15= 1950 ; 13= 1951?? ; 2= 1951? ; 8= 1951 ; 4= 1952?? ; 6= 1952? ; 7= 1952 ; 1= 1953?? ; 1= 1953? ; 15= 1953 ; 8= 1954? ; 15= 1954 ; 11= 1955? ; 15= 1955 ; 39= 1956? ; 8= 1956 ; 15= 1957? ; 9= 1957 ; 8= 1958? ; 35= 1958 ; 18= 1959? ; 12= 1959 ; 3= 1960? ; 11= 1960 ; 4= 1961? ; 1= 1961 ; 1= 1962?? ; 4= 1962? ; 1= 1963? ; 4= 1963 ; 1= 1965 ; 12= 9999? ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):836


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