(!!!) (Best Single) 5998A Sylvania JAN NOS 1980 (127/135mA) (close Gm)

5998A Sylvania JAN NOS 1980 (5998A=7236) 127mA Gm=16,400 135mA Gm=16,700   TESTED ON AMPLITREX Good mA = 100mA+ Good Gm = 15K+   BEST FOR:--------Peter Millett headphone ampWoo Audio 2Woo Audio 3Woo Audio WA3+Darkvoice 336iDarkvoice 336SEFi 421A Singepower Extreme   (5998 is an uprated 6AS7G and has a 13 watt plate dissipation rating)(the 5998 sounds very clear and has superb overall sonics, the 421A Western Electric sounds even better; slightly more magical sound)(5998 Mu = 5.4, Gm = 15500, Rplate = 350 ohms, Vplate max = 250 volts and Vplate max 5998A = 275V)(7236 Mu = 4.8, Gm = 12500, Rplate = 350 ohms, Vplate max = 300 volts)(7236 is a computer rated 5998A, 7236 and 5998A are uprated from 5998)(6AS7G Mu = 2, Gm = 7000, Rplate = 280 ohms)(6080 Mu = 2, Gm = 6500-7000, Rplate = 280-300 ohms)5998 substitute = 7236 7236 is a computer rated 5998A5998 RATINGS:------------Filament Voltage 6.3 V Filament Current 2.4 A Plate Voltage (max) 250 V Plate Current (max) 125 mA Plate Dissipation (m