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(!!) (#4 31 PAIR) 31 Westinghouse and Sylvania NOS same build 1940's (12.0ma and 12.8ma)

(!!) (#4 31 PAIR) 31 Westinghouse and Sylvania NOS same build 1940's (12.0ma and 12.8ma)

$ 29.99

1 pair) 31 Westinghouse and Sylvania NOS same build 1940's

1 tube) 12.0ma Gm=900 Westinghouse

1 tube) 12.8ma Gm=1000 Sylvania

 

Matched on Amplitrex

Vplate=180V

Vgrid=-30V

Good NOS Ma = 11 -12ma

Good Gm = 1000

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