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(!!!!) (Best Overall Pair) 50 RCA Cunningham engraved base NOS and RCA like new ST-19 1930's - 1940 era (59.8ma and 61.5ma) (strong Ma and Gm)
(!!!!) (Best Overall Pair) 50 RCA Cunningham engraved base NOS and RCA like new ST-19 1930's - 1940 era (59.8ma and 61.5ma) (strong Ma and Gm)
$ 579.99
1 matched pair) 50 RCA Cunningham 1930's - 1940 - 100% same build - super large getters
1 tube) 61.5ma Gm=2300 engraved base NOS very small "2" etched near guide pin
1 tube) 59.8ma Gm=2380 printed base 1940 era like new
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 Pair) 50 RCA Cunningham engraved base NOS and RCA like new ST-19 1930's - 1940 era (59.8ma and 61.5ma) (strong Ma and Gm) "Pin It")
 (Best Overall Pair) 50 RCA Cunningham engraved base NOS and RCA like new ST-19 1930's - 1940 era (59.8ma and 61.5ma) (strong Ma and Gm)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_239ed211-bd95-4d49-9f1a-3350a3843db0.jpg?v=1741102868){kind=link}