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(!!!!) (Best Overall Single) 50 RCA Cunningham engraved base NOS ST-19 around 1940 (61.5ma) (strong Ma and Gm)

$ 279.99

1 tube) 50 RCA Cunningham engraved base NOS ST-19 around 1940 small "2" etched near guide pin

61.5ma

Gm=2300

 

Tested on Amplitrex

Vplate=440V

Vgrid=-66V

Good NOS Ma = 55-60ma

Good NOS Gm = 2100

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