Home » Power Tubes » (!!) (Recommended Pair) 6S4A Westinghouse black plate NOS -1963 era (20ma and 21.2ma)

(!!) (Recommended Pair) 6S4A Westinghouse black plate NOS -1963 era (20ma and 21.2ma)

Name: (!!) (Recommended Pair) 6S4A Westinghouse black plate NOS -1963 era (20ma and 21.2ma)
Brand: Tube World
SKU: 6S4Apr
Price: 19.99 USD
Availability: InStock

$ 19.99

1 pair) 6S4A Westinghouse black plate NOS -1963 era

1 tube) 21.2ma and Gm=4200 (1963)

1 tube) 20.0ma and Gm=4200 (1963 era)

Tested on Amplitrex

Vplate=250V

Vgrid=-8V

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)