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(!!!!) (Best Overall Single) 50 RCA Cunningham engraved base NOS ST-19 around 1940 (61.5ma) (strong Ma and Gm)
(!!!!) (Best Overall Single) 50 RCA Cunningham engraved base NOS ST-19 around 1940 (61.5ma) (strong Ma and Gm)
$ 299.99
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
See more: vacuum tube
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 (Best Overall Single) 50 RCA Cunningham engraved base NOS ST-19 around 1940 (61.5ma) (strong Ma and Gm)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/50nos_8f4e1595-5e7f-4888-b46e-3b271cde572f.jpg?v=1571438978){kind=link}
 (Best Overall Single) 50 RCA Cunningham engraved base NOS ST-19 around 1940 (61.5ma) (strong Ma and Gm) "Pin It")