Vacuum Tube - 5963 / 12AU7A, Dual Triode
New-Old-Stock (NOS) tube.
The 5963 is a miniature, medium-mu twin triode for use as a frequency divider in computer applications. When used in such "on-off" control applications, the 5963 will maintain its emission capabilities after long periods of operation under cutoff conditions. Intended primarily for computer applications, the tube is not in general superior to other types for conventional amplifier applications, nor should it be used in applications critical as to microphonics or plate-current unbalance.