High-Mu Twin Triode
1950's Black Plate
The Sylvania Black Plate JHS-12AU7 Vacuum tube was made
in the early 1950'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.
The Sylvania JHS-12AU7 tube has a Deep, Smooth, and
Detailed sound and is Excellent in stereo amps and
headphone preamplifiers.
Sylvania JHS-12AU7 tubes are one of the best.
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