Y – Low loss mica-filled phenolic resin ("Micanol") base for RF use.WA, WB – Improved, backward compatible military/industrial variants.GT/G – Glass bulb, T-9 size interchangeable with G and GT types.A, B, C – Improved backward compatible versions.Suffix letters distinguish revisions or variants:.A single numeral that represents the number of active elements in the tube.One or two letters assigned to the devices in order of development.The first character group is a number representing the heater voltage rounded to the nearest whole number 0 indicates a cold-cathode tube.RETMA is the acronym for the Radio Electronic Television Manufacturers Association formed in 1953 - however the standard itself had already been in use since 1933, when RCA/Cunningham introduced the 1A6, 2A3, 2A5, etc. 15.2 General literature and data sheets.14 Compagnie des Lampes (1921, "French Mazda") and Mazda-Belvu.12.3 Shielded tubes for Majestic radios.12.2 Tubes with indirectly heated cathodes.12.1.7 Directly AC-heated rectifier tubes.12.1 Tubes with directly heated cathodes.12 List of tubes used in 1920s and 1930s radio receivers.11.15 Lettered Loctal tubes used in Philco radios.8 List of Pro Electron professional tubes.7 List of European Mullard–Philips tubes.4.14 Other tubes with nonstandard heater voltages.4.2.1 1.25 volt DC filament subminiature tubes.4.1.1 Voltage stabilisers and references.
4.1 "0 volt" gas-filled cold cathode tubes.3.6.1 British CV and M8000s naming systems.3.3.4 Tungsram receiving tubes system before 1934.
3.2.9 STC/Brimar receiving tubes system.3.2.3 EdiSwan ("British Mazda") systems.
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