Vacuum Tube - 12DT8, Triode, Dual
New-Old-Stock (NOS) tube.
The 12DT8 is a general-purpose high-mu twin triode of the 9-pin miniature type intended for use as an rf amplifier and as a combined oscillator-mixer in fm tuners. This tube is also useful in a wide variety of applications in radio and television receivers.
In the 12DT8, the two units are effectively isolated from each other by an internal shield having a separate base-pin terminal. As a result, each unit will give stable performance when used in high-frequency applications. In addition, separate pin terminals for each cathode provide the equipment designer with greater flexibility of circuit connections.