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410 Deforest Audio Balloon engraved base NOS original box 1930 era (32.6ma)

$ 399.99

1 tube) 410 Deforest Audio Balloon engraved base NOS original box 1930 era - oxide coated filament

32.6ma

Gm=2250

NOT A PAIR

 

Vplate=300V, Vgrid=-15V

Good Ma range=20-30ma

Good Gm range 1800-2000

 

- Power Triode

- Very Rare

 

General Information

(Filament=7V @ 1.2A, Vplate=220V, Vgrid=-7V, Iplate=25ma, Mu=6, Rp=6Kohms)

(The VT-25 is built exactly the same as a VT-52, but the plate and grid are spaced  differently yielding different Mu factors and plate resistance)

 

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