Half-Wave Rectifier
The 12D4 Vacuum tube is a glass octal type used as a
damper tube in horizontal-deflection circuits of
television receivers. It requires an octal socket.
Socket terminals 1, 2, 4 and 6 should not be used as tie
points. This tube, like other power-handling tubes,
should be adequately ventilated.
Electrical Data:
Heater Voltage ......................... 12.6 V
Heater Current .......................... 0.6 A
Preferred Substitutes ................. 12DM4
Substitutes ..................... 12AX4 12DQ4