High-Mu Twin Triode
The Motorola 12AU7A Vacuum Tube 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 headphone preamplifiers.
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