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(!!) (Recommended Pair) 8417 Sylvania NOS 1970 era same date codes (109ma and 104.5ma)
(!!) (Recommended Pair) 8417 Sylvania NOS 1970 era same date codes (109ma and 104.5ma)
$ 219.99
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
See more: vacuum tube
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