The RCA 12AU7A Clear Top Vacuum tube is arguably the Best
of the American made 12AU7A's. It is a miniature type
used as a phase inverter or push-pull
amplifier in ac/dc radio equipment and as a
multivibrator or oscillator in industrial control
devices. It is also used as a combined vertical
oscillator and vertical-deflection amplifier, and as a
horizontal-deflection oscillator in tv receivers.
These tubes are also used in High End Audio headphone
preamplifiers as well as Guitar and Bass amplifiers.
It requires a miniature 9-contact socket.
Electrical Data:
Heater Voltage ................. 6.3/12.6 V
Heater Current ................. 0.3/0.15 A
Preferred Substitutes .............. 12AT7
Substitutes .................. 12AZ7, 12BH7