6EM7 GE Amperex NOS 1970's 2.4ma Gm=2200 34ma Gm=6000   Tested on Amplitrex Good Ma Triode 1 = 1.5ma Gm=1500 Good Ma Triode 2 = 30-40ma Gm=6000-7000   for: Joule Electra LA-100 MK3Modwright power supplyWright Sound phono wpp-200cWright Sound WLA12A preampKenji Mizushima KensoMusic Reference 6EM7 ampWelbourne Apollo mono amps (KR/VAIC VV52B or 300B output tubes)