Famous Types
Many of the "1A21" series are well known to collectors and restorers of WW2 vintage radio equipment. A short list of well-known or historic types numbered under this system:
- 1N23--Silicon point contact diode used in early radar mixers.
- 1P25--Infrared image converter used in WW2 night vision "sniperscopes".
- 2C39--"Oilcan" type planar triode.
- 2C43--"Lighthouse" type planar triode.
- 2D21--Miniature glass tetrode thyratron used in jukeboxes and computer equipment.
- 2P23--Early image orthicon TV camera tube.
- 3B28--Xenon half wave rectifier--ruggedized replacement for mercury vapor type 866.
- 3E29--Dual beam power tube used in radar equipment--a pulse rated variant of the earlier 829B.
- 4D21--VHF beam tetrode better known by Eimac commercial number 4-125A.
- 5C22--Hydrogen thyratron for radar modulators.
- 6C21--Triode radar modulator for "hard tube" pulsers.
- 8D21--Internally water cooled dual tetrode used in early VHF TV transmitters.
This numbering system was abandoned in 1944 in favor of a non-descriptive numbering system of 4 digit numbers beginning with 5500. This new system persisted until the final days of tubes, with type numbers registered up into the 9000 series.
Read more about this topic: RMA Tube Designation
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—Anonymous. Late 19th century ballad.
The quatrain refers to the famous case of Lizzie Borden, tried for the murder of her father and stepmother on Aug. 4, 1892, in Fall River, Massachusetts. Though she was found innocent, there were many who contested the verdict, occasioning a prodigious output of articles and books, including, most recently, Frank Spiering’s Lizzie (1985)
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—Saul Bellow (b. 1915)