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(!!) (Recommended Pair) 8417 Sylvania NOS 1970 era same date codes (109ma and 104.5ma)

By Tube World

$ 269.99

1 pair) 8417 Sylvania NOS 1970 era same date codes

1 tube)

Ma plate=109ma

Ma screen=4.4ma

Gm=22,200

1 tube) 

Ma plate=104.5ma

Ma screen=4.6ma

Gm=22,500

 

Tested on Amplitrex:

Vplate=300V

Vscreen=300V

Vgrid=-12V

Good NOS Ma range 85-100ma

Good Gm = 21,000-23,000

 

For:

- UFO

- Fisher SA-1000

- Dynaco

- Quicksilver

- Dynaco Mark VI introduced in 1976

- Gibson

- Bogen

- Harmon Kardon

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