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(!!) (#2 31 PAIR) 31 Tungsol and RCA Victor NOS same build 1940-1947 (12.8ma and 13.0ma)

(!!) (#2 31 PAIR) 31 Tungsol and RCA Victor NOS same build 1940-1947 (12.8ma and 13.0ma)

$ 31.99

1 pair) 31 Tungsol and RCA NOS same build 1940-1947

1 tube) 12.8ma Gm=1100 Tungsol engraved base 1940

1 tube) 13.0ma Gm=1100 RCA Victor 1947

 

Matched on Amplitrex

Vplate=180V

Vgrid=-30V

Good NOS Ma = 11 -12ma

Good Gm = 1000

See more: vacuum tube
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