New-Old-Stock (NOS) tube.

The 6005 is a miniature beam-power pentode for use as an audio-frequency power amplifier. In this application the tube is capable of delivering an output of approximately 4.5 watts. The 6005 is a special-quality tube for use in critical industrial and military applications in which operational dependability is of primary importance.

Features of the tube include a high degree of mechanical strength and a heater-cathode construction capable of withstanding many thousand cycles of intermittent operation. When used in on-off control applications, the tube will maintain its emission capabilities after long periods of operation under cutoff conditions.