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(!!) (#1 31 Pair) 31 National Union engraved base NOS 1930's (13.8ma and 14.2ma)

(!!) (#1 31 Pair) 31 National Union engraved base NOS 1930's (13.8ma and 14.2ma)

$ 35.99

1 pair) 31 National Union engraved base NOS 1930's

1 tube) 13.8ma Gm=1100 

1 tube) 14.2ma Gm=1200

 

power triode

 

Matched on Amplitrex

Vplate=180V

Vgrid=-30V

Good Iplate = 11 - 12ma

Good Gm = 1000

 

 

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