Antique radios, Old Time Radios

25L6GT

ID = 2964

Country:

United States of America (USA)

Brand:	Common type USA tube/semicond. Common type USA tube/semicond. Hytron; Salem (MA) RCA (RCA Victor Co. Inc.); New York (NY) Webcor (tube brand) - see also Webster-Chicago and Webcor; Chicago, IL
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

Multiple differences or of other kind:

7561

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 / Specified current AC/DC ~ = (Series working)

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)

Information source

Essential Characteristics, GE 1973
Taschenbuch zum Röhren-Codex 1948/49

25L6GT: U.G. Urs Gloor
25L6GT: RTT Schwandt Günther Stabe † 19.8.20 More ...	Just Qvigstad	25L6GT: Sylvania Technical Manual Peter Hoddow More ...

Usage in Models

2= 1938?? ; 4= 1938? ; 22= 1938 ; 13= 1939?? ; 58= 1939? ; 100= 1939 ; 11= 1940?? ; 35= 1940? ; 47= 1940 ; 12= 1941?? ; 5= 1941? ; 25= 1941 ; 8= 1942?? ; 17= 1942? ; 10= 1942 ; 1= 1943?? ; 2= 1943? ; 1= 1944? ; 3= 1944 ; 4= 1945?? ; 4= 1946?? ; 18= 1946 ; 12= 1947?? ; 4= 1947? ; 13= 1947 ; 3= 1948?? ; 12= 1948? ; 29= 1948 ; 7= 1949? ; 29= 1949 ; 5= 1950?? ; 35= 1950? ; 23= 1950 ; 13= 1951?? ; 67= 1951? ; 2= 1951 ; 4= 1952?? ; 103= 1952? ; 7= 1952 ; 1= 1953?? ; 2= 1953? ; 15= 1953 ; 1= 1954?? ; 5= 1954? ; 15= 1954 ; 36= 1955? ; 13= 1955 ; 45= 1956? ; 8= 1956 ; 39= 1957? ; 7= 1957 ; 21= 1958? ; 30= 1958 ; 18= 1959? ; 12= 1959 ; 2= 1960?? ; 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):1083

Collection of

25L6GT

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25L6GT

Common type USA tube/semicond.

Collection of