25L6
The 25L6 is an
The tube used EIA base 7AC in common with many other power tubes. The tube was identical in design and ratings with the 50L6 with the exception of having a 25 volt 300 mA heater, whereas the 50L6 has a 50 volt 150 mA heater. The 12L6 and identical 12W6 were made with a 12 volt, 600 mA heater, and the 6W6 was made with a 6.3V, 1200mA heater. There was also a 35L6 with a 35V, 150 mA heater. Because of the slightly lower-power heater, the 35L6 has slightly lower output than the rest of the family.
This family is not to be confused with the
The 25L6 was introduced as a metal tube on November 4, 1936, but most examples of this family were made of glass. The ST14 glass 25L6G came out on March 30, 1937. The T9 size GT version came out on April 11, 1938. There was also a 25L6G in the smaller ST-12 glass envelope.
Computer equipment used this tube as a relay driver or to run the
See also
References
- 25L6/50L6 datasheet - GE Datasheet January 1950
- Sibley, Ludwell, Tube Lore, 1996