The 7A5 is a beam power amplifier vacuum tube designed for low-plate-voltage audio output stages in radio receivers, mobile equipment, and automobile receivers. Units are available in both new old stock (NOS) and tested used conditions. Manufactured by companies including Sylvania, Philco, RCA, and GE, these tubes feature a 6.3V filament rating and an 8-pin lock-in (loctal) base in a glass envelope construction. Used for servicing vintage radio chassis, broadcast receivers, and audio power amplifier stages requiring high power output at low plate supply voltages.