(!!!!) (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
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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
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$299.98
$579.99
(+$280.01)