(!) (Best Pair) 6S4A Tungsol NOS "D" and "U" getter halo 1957-1960 (24.5ma and 26ma)

$ 15.99

1 pair) 6S4A Tungsol NOS black plates 1957-1960

1 tube) 24.5ma and Gm=4400 "D" getter halo 1957

1 tube) 24.5ma and Gm=4400 "U" getter halo 1957-1960


Tested on Amplitrex



Good Ma range 20-25ma

Good Gm range 4000-4500


(the 6S4A features high plate current at relatively low plate voltages and is capable
of withstanding high pulse voltages)(Vfil=6.3V @ 600ma)
MAX Ratings: Vplate=550V, Iplate=30ma, Pout=8.5 watts
Typical Operation: Vplate=250V, Vgrid=-8V, Iplate=24ma, Mu=16.5, Gm=4500, Rplate=3700 ohms)


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