6F8G Raytheon NOS 1945 era (5.8/5.4ma)

6F8G Raytheon parallel black plates NOS 1945 era

5.8ma Gm=2200

5.4ma Gm=2300

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