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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