6AN8A RCA gray plates used/tests like new 1960's (16.6/12.4ma)

6AN8A RCA gray plates used/tests like new 1960's

16.6ma Gm=4500

12.4ma Gm=6300

Tested on Amplitrex

Good Ma/Gm (triode) = 13-15ma and Gm= 3800-4500

Good Ma/Gm (pentode) =  11-12ma Gm=7000-7500