(!) (SINGLE) 6F8G Sylvania Zenith coated glass parallel plates like new 1940's (9.0/8.4ma)

6F8G Sylvania Zenith coated glass parallel plates like new 1940's

1 tube) 9.0ma Gm=2800

1 tube) 8.4ma Gm=2600

Good Ma range 7-10ma

Good Gm range 2400-2600 

- 6F8G is electrically the same as a 6SN7GT but has a top cap for 1 grid connection

information:

GE, Sylvania and Raytheon have mirror image parallel black plates

RCA and Ken Rad have staggered black ribbed plates

Tungsol have parallel round black plates