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
Famous quotes containing the words famous and/or types:
““Why visit the playhouse to see the famous Parisian models, ... when one can see the French damsels, Norma and Diana? Their names have been known on both continents, because everything goes as it will, and those that cannot be satisfied with these must surely be of a queer nature.””
—For the City of New Orleans, U.S. public relief program (1935-1943)
“The rank and file have let their servants become their masters and dictators.... Provision should be made in all union constitutions for the recall of leaders. Big salaries should not be paid. Career hunters should be driven out, as well as leaders who use labor for political ends. These types are menaces to the advancement of labor.”
—Mother Jones (1830–1930)