The Telefunken smooth plate is slightly warmer sounding
than ribbed plate types.
This Telefunken 12AU7 is an excellent sounding tube!
One of the best.
The Telefunken ECC82 / 12AU7 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.
They are Extensively used by Audiophiles in high end
sterio and other audio equipment.
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, ECC82
Substitutes ......................... 12AZ7 12BH7