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(!!) (BEST VALUE PAIR) 8417 Sylvania rebranded GE NOS in white boxes 1970's (86ma and 84ma)
(!!) (BEST VALUE PAIR) 8417 Sylvania rebranded GE NOS in white boxes 1970's (86ma and 84ma)
By Tube World
$ 209.99
1 pair) 8417 Sylvania branded GE 1970's
1 tube) 1976 (JK)
Ma plate=86ma
Ma screen=3.5ma
Gm=20,000
1 tube) 1972 (RF)
Ma plate=84ma
Ma screen=6.3ma
Gm=18,000
Tested on Amplitrex:
Vplate=300V
Vscreen=300V
Vgrid=-12V
Good NOS Ma range 85-100ma
Good Gm = 21,000-23,000
Tested on Amplitrex:
Vplate=300V
Vscreen=300V
Vgrid=-12V
Good NOS Ma range 80-110ma
Good NOS Gm = 20-23,000
Recommended For:
- UFO
- Fisher SA-1000
- Dynaco
- Quicksilver
- Dynaco Mark VI introduced in 1976
- Gibson
- Bogen
- Harmon Kardon
- Gibson-Standel SG-410 amp
See more: vacuum tube
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 (BEST VALUE PAIR) 8417 Sylvania rebranded GE NOS in white boxes 1970's (86ma and 84ma) "Pin It")