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

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