84=6Z4 RCA NOS GT-shape glass slightly tilted glass 1967 (44/40 and 47/40)

84=6Z4 RCA NOS GT-shape slightly tilted glass 1967 (BR)

44/40

47/40

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