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(!!) (Best Value Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build (21.3ma and 22.2ma)
(!!) (Best Value Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build (21.3ma and 22.2ma)
$ 69.99
1 Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build in white boxes
1 tube) 21.3ma Gm=1600 (1930's) engraved base - some vertical scratches on glass
1 tube) 22.2ma Gm=1700 (1940 era) printing base - SHORTER bottle
Tested on Amplitrex
Vplate=180V
Vgrid=-38V
Good Ma = 20ma
Good Gm = 1600-1700
See more: vacuum tube
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 (Best Value Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build (21.3ma and 22.2ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_651e95b0-9797-4ff8-ba27-92ca61a63814.jpg?v=1721418507){kind=link}
 (Best Value Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build (21.3ma and 22.2ma) "Pin It")