(!!!!) (Factory Matched Pair) 8417-P Sylvania NOS same build 1960's (84ma and 85.5ma)

1 matched pair) 8417-P Sylvania NOS 1960's 1 tube)  Iplate=84ma Iscreen=3.6ma Gm=20,100 1 tube)  Iplate=85.5ma Iscreen=4.5ma Gm=20,450   Tested on Amplitrex: Vplate=300V Vscreen=300V Vgrid=-12V Good used Ma range 90-110ma Good Gm = 21-23,000    For: - UFO - Fisher SA-1000 - Dynaco - Quicksilver - Dynaco Mark VI introduced in 1976 - Gibson - Bogen - Harmon Kardon