Power Pentode
The Philco 42 Vacuum Tube is a glass type used in audio
output stages in AVC receivers. This type is identical
electrically with type 6F6. It was first manufactured by
RCA way back in 1937.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.7 A
Substitutes .......................... 41