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6S4 RCA USA black plate NOS 1953 (21ma)

6S4 RCA USA black plate NOS 1953 (21ma)

$ 7.99

1 tube) 6S4 RCA black plate NOS "U" getter 1953 

21ma

Gm=4300

 

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)

 

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