New-Old-Stock (NOS) tube.

The 5965-A is a miniature twin-triode primarily designed for service in computer applications. Each triode section features a high zero-bias plate current, a sharp-cutoff characteristic, and a separate cathode connection. In addition, the balance of the cutoff characteristic between the two sections is controlled. When used in "on-off" control applications, the 5965-A will maintain its emission capabilities after long periods of operation under cutoff conditions. The heater-cathode construction of the tube is designed for dependable service under conditions of intermittent operation.

The 5965-A, when operated under approved conditions, will exhibit a life of greater than 10,000 hours, averaged over a 100 tube lot, and based on the 10,000 hour end-of-life point shown under Special Tests and Ratings.