6SN7GTVT-231RCABranded CrcRound TipBaseBlackCountryUSAGetterO-Getter HaloGlass ColorBlack GlassManufacturer ExtendedRadio Corp. of AmericaPermanentidhtwq7m46wPin ColorSilver PinsSpecial UseJAN - USA Joint Army NavyTip ShapeRound TipYear1945More 6SN7GT type tubes6SN7GTBranded Cossor6SN7GT, VT-231Branded Ge6SN7GTBranded CbsHytron6SN7GT, R92Branded Mullard6SN7GT, R93MazdaBranded PhilipsMiniwatt6SN7GTBranded Brimar6SN7GTBranded Sylvania6SN7GT, VT-231Branded Tung-Sol6SN7GTBranded Tungsram6SN7GT, B65Branded PinnacleMore VT-231 type tubes6SN7GT, VT-231Branded Ge6SN7GT, VT-231Branded Tung-SolVT-231, 6SN7GTWestern ElectricBranded RaytheonVT-231, 6SN7GTBranded Ken-RadMore tubes manufactured by RCA5963RCABranded Leeds & Northrup7058RCABranded RCA5R4GYRCABranded Sylvania12AU7ARCABranded Superior7027ARCABranded Conn6BH6RCABranded Dumont7025RCABranded Wurlitzer6973RCABranded Kinsman5R4GYRCABranded Amperex7025, 12AX7ARCABranded Magnavox