(!!!) (Best Pair) 8417 Sylvania branded RCA NOS 1970's (128ma and 131ma)
$ 249.99
1 pair) 8417 Sylvania branded RCA NOS 1970's top and side getters - 1 tube has faded printing
1 tube) faded printing - on left
Ma plate=128ma
Ma screen=5.5ma
Gm=25,500
1 tube)
Ma plate=131ma
Ma screen=5.0ma
Gm=24,500
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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 (Best Pair) 8417 Sylvania branded RCA NOS 1970's (128ma and 131ma) "Pin It")