Vacuum Tube - 2A3, RCA, Triode, Power Amplifier
New-Old-Stock (NOS) tube.
Also known by US military identifier VT-95.
The 2A3 is a three-electrode, high-vacuum type of power amplifier tube for use in the power-output stage of a-c operated receivers. The exceptionally large power-handling ability of the 2A3 is the result of its design features. Among these are its extremely high transconductance and its large effective cathode area.