374A Western Electric black plate used/good 1960's (18-21ma) (3 in stock)374A Western Electric black plate used good 1960's (18 21ma) 1) 20. 2ma Gm=3400 1968 1) 19. 2ma Gm=3200 1967 1) 20. 0ma Gm=3400 1968 0) 18. 4ma Gm=2900 1967 0) 20ma Gm=2900 1967 0) 18. 2ma Gm=2900 1967 0) 19. 8ma Gm=2900 1968 0) 19. 6ma Gm=3100 1965 0) 20. 2ma Gm=3200 1967 0) 18. 6ma Gm=3200 1967 MAKE TUBE SELECTION AT CHECKOUT Tested on Amplitrex Vplate=135V Vscreen=135V Vgrid= 18V Good used Ma range = 18 21ma Good used Gm range = 2800 3000 (374A