New-Old-Stock (NOS) tube.

The 3A5 is intended for use in high frequency applications. The relatively large filament employed in the 3A5 enables it to supply the high peak currents required in RF power applications. In class C service, a 3A5 with its units in push-pull will deliver a power output of approximately 2 watts at 40 megacycles. It may be used at still higher frequencies with reduced efficiency. Each triode may be used independently of the other.