(!!) (Pair) 71A RCA Victor and Super Silvertone used/good 1930”s – 1940”s (21.5ma and 25ma) (Same Gm)

1 Pair) 71A RCA Victor and Super Silvertone used/good 1930”s – 1940”s in white boxes – different shpae top mica

1 tube) 25.0ma Gm=1700 (1930”s) Super Silvertone

1 tube) 21.5ma Gm=1800 (1940”s) RCA Victor

Tested on Amplitrex

Vplate=180V

Vgrid=-38V

Good Ma = 20ma

Good Gm = 1600-1700