84=6Z4 RCA NOS GT-shape glass tilted glass 1967 (47/40 and 48/40)

84=6Z4 RCA NOS GT-shape slightly tilted glass 1968 (CB)

47/40

48/40

NOTE: YOU CANNOT! SUB THESE 6Z4 for the CHINESE branded 6Z4

(84=6.3V @ 500ma Filament, 1250V PIV, 60ma)

Philco Model 40-180 1939-1940