(Best Single #2) 6C8G RCA black plates NOS 1957 (4.2/3.8ma) (Same Gm)

6C8G RCA black plates NOS 1957

4.2ma Gm=1500

3.8ma Gm=1500

Tested in Amplitrex

Vplate = 250V

Vgrid = -4.6V

Good NOS Ma = 3ma

Good NOS Gm 1500-1600

dual-triode

You can buy an adapter socket on EBAY to sub this tube for a 6SL7GT