84=6Z4 Greylock USA by National Union like new condition 1940's (49/40 and 54/40)

84=6Z4 Greylock USA by National Union like new condition 1940's in WB

49/40

54/40

TESTED on TV-7D/U: 40 is minimum pass for good

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

SPECS:

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

USED IN:

Philco Model 40-180 1939-1940