The 25L6 is an octal-based vacuum tube of the beam-power tetrode type. It found common application in AC/DC radio receivers - such as those of the All American Five type - and was also found in large numbers in early computers, such as the UNIVAC I. In electronics, a vacuum tube (U.S. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ... A tetrode is a two-grid vacuum tube. ... For the device which is a tuner (radio) and a amplifier and/or loudspeaker, see receiver (home stereo). ... The All American Five was a superheterodyne radio receiver designed in the USA in the 1930s. ... The tower of a personal computer. ... UNIVAC I central complex, containing the central processor and mercury memory. ...
For example, a 12SK7 was used in lieu of a 6SK7, while the audio output valve was a 50L6 instead of a 25L6.
Additionally, the bias on the 25L6 (50L6 in 110V set) was only -1.5V, as supplied by a dry cell.
Radio Corporation's Astor receivers also used two 25L6 valves (similar to the 35L6) operating in push-pull in the audio output stages of their 32V HT receivers.
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