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- RMA_tube_designation abstract "In the years 1942-1944, the Radio Manufacturers Association used a descriptive nomenclature system for industrial, transmitting, and special-purpose vacuum tubes. The numbering scheme was distinct from both the numbering schemes used for standard receiving tubes, and the existing transmitting tube numbering systems used previously, such as the \"800 series\" numbers originated by RCA and adopted by many others.The system assigned numbers with the base form \"1A21\", and this numbering scheme is occasionally referred to by tube collectors and historians as the \"1A21 system\".The first digit of the type number was 1-9, providing a rough indication of the filament/heater power rating (and therefore the overall power handling capabilities) of the tube. The assigned numbers were as follows:1-- No filament/heater, or cold cathode device2-- Up to 10 W3-- 10-20 W4-- 20-50 W5-- 50-100 W6-- 100-200 W7-- 200-500 W8-- 500W-1 kW9-- More than 1 kWThe second character was a letter broadly identifying the class of tube:A-- Single element (ballast, barretter)B-- Two-element device such as:DiodeTransmit/receive tube (TR cell), cold-cathode water vapor discharge tube for use in radar systems, shorts the receiver input to protect it while the transmitter operatesAnti-transmit/receive tube (ATR cell), cold-cathode water vapor discharge tube for use in radar systems, decouples the transmitter from the antenna while not operating, to prevent it from wasting received energySpark gapC-- TriodeD-- TetrodeE-- Pentode or beam power tetrodeF-- HexodeG-- HeptodeH-- OctodeJ-- Magnetically controlled types, usually incorporating a resonator (essentially, magnetrons)K-- Electrostatically controlled types, including a resonator (klystrons and inductive output tubes)L-- Vacuum capacitorsN-- Crystal rectifiers (This designation lived on as the \"N\" in the EIA/JEDEC EIA-370 solid state device numbers standard, like 2N2222)P-- Photosensitive types (phototubes, photomultipliers, camera tubes, image converters)Q-- Resonant vacuum cavities R-- Ignitrons and mercury arc rectifiersS-- Vacuum switchesT Storage, radial beam, and deflection control tubes (no known examples assigned)V-- Flash tubesW-- Travelling wave tubeX-- X-ray tubeY-- Thermionic converterThe last 2 digits were serially assigned, beginning with 21 to avoid possible confusion with receiving tubes or CRT phosphor designations.Multiple section tubes (like the 3E29 or 8D21) are assigned a letter corresponding to ONE set of electrodes.".
- RMA_tube_designation wikiPageID "16385915".
- RMA_tube_designation wikiPageLength "5651".
- RMA_tube_designation wikiPageOutDegree "40".
- RMA_tube_designation wikiPageRevisionID "561584938".
- RMA_tube_designation wikiPageWikiLink 2N2222.
- RMA_tube_designation wikiPageWikiLink Beam_deflection_tube.
- RMA_tube_designation wikiPageWikiLink Category:Electronics_lists.
- RMA_tube_designation wikiPageWikiLink Category:Vacuum_tubes.
- RMA_tube_designation wikiPageWikiLink Cavity_magnetron.
- RMA_tube_designation wikiPageWikiLink Diode.
- RMA_tube_designation wikiPageWikiLink Eimac.
- RMA_tube_designation wikiPageWikiLink Electrical_ballast.
- RMA_tube_designation wikiPageWikiLink Electronic_Industries_Alliance.
- RMA_tube_designation wikiPageWikiLink Flashtube.
- RMA_tube_designation wikiPageWikiLink Ignitron.
- RMA_tube_designation wikiPageWikiLink Inductive_output_tube.
- RMA_tube_designation wikiPageWikiLink Iron-hydrogen_resistor.
- RMA_tube_designation wikiPageWikiLink JEDEC.
- RMA_tube_designation wikiPageWikiLink Klystron.
- RMA_tube_designation wikiPageWikiLink List_of_vacuum_tubes.
- RMA_tube_designation wikiPageWikiLink Mercury-arc_valve.
- RMA_tube_designation wikiPageWikiLink Mullard–Philips_tube_designation.
- RMA_tube_designation wikiPageWikiLink Night_vision.
- RMA_tube_designation wikiPageWikiLink Night_vision_device.
- RMA_tube_designation wikiPageWikiLink Pentagrid_converter.
- RMA_tube_designation wikiPageWikiLink Pentode.
- RMA_tube_designation wikiPageWikiLink Photomultiplier.
- RMA_tube_designation wikiPageWikiLink Phototube.
- RMA_tube_designation wikiPageWikiLink RETMA_tube_designation.
- RMA_tube_designation wikiPageWikiLink Radar.
- RMA_tube_designation wikiPageWikiLink Rectifier.
- RMA_tube_designation wikiPageWikiLink Russian_tube_designations.
- RMA_tube_designation wikiPageWikiLink Spark_gap.
- RMA_tube_designation wikiPageWikiLink Storage_tube.
- RMA_tube_designation wikiPageWikiLink Tetrode.
- RMA_tube_designation wikiPageWikiLink Thermionic_converter.
- RMA_tube_designation wikiPageWikiLink Thyratron.
- RMA_tube_designation wikiPageWikiLink Traveling-wave_tube.
- RMA_tube_designation wikiPageWikiLink Triode.
- RMA_tube_designation wikiPageWikiLink Vacuum_tube.
- RMA_tube_designation wikiPageWikiLink Vacuum_variable_capacitor.
- RMA_tube_designation wikiPageWikiLink Video_camera_tube.
- RMA_tube_designation wikiPageWikiLink X-ray_tube.
- RMA_tube_designation wikiPageWikiLinkText "RMA tube designation".
- RMA_tube_designation wikiPageUsesTemplate Template:Portal.
- RMA_tube_designation subject Category:Electronics_lists.
- RMA_tube_designation subject Category:Vacuum_tubes.
- RMA_tube_designation type List.
- RMA_tube_designation type Component.
- RMA_tube_designation type List.
- RMA_tube_designation comment "In the years 1942-1944, the Radio Manufacturers Association used a descriptive nomenclature system for industrial, transmitting, and special-purpose vacuum tubes.".
- RMA_tube_designation label "RMA tube designation".
- RMA_tube_designation sameAs Q7276983.
- RMA_tube_designation sameAs m.03wj7_y.
- RMA_tube_designation sameAs Q7276983.
- RMA_tube_designation wasDerivedFrom RMA_tube_designation?oldid=561584938.
- RMA_tube_designation isPrimaryTopicOf RMA_tube_designation.