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6FD7 Sylvania Big Bottle black plates NOS 1970 era (1.1ma/90ma)

6FD7 Sylvania Big Bottle black plates NOS 1970 era (1.1ma/90ma)

$ 15.99

1 tube) 6FD7 Sylvania Big Bottle black plates NOS 1970 era

1 section) 1.1ma Gm=1400

1 section) 90ma Gm=11,00

NOT A PAIR
 

Tested on Amplitrex

Triode section #1

Vplate=250V

Vgrid=-3V

Good Ma range 1.2-1.4ma

Good Gm range 1400-1600

Triode Section #2

Vplate=150V

Vgrid=-17.5V

Good Ma range = 35-40ma

Good Gm range = 6500-7500

See more: vacuum tube
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