Vacuum Tube - 25L6, Beam Power Amplifier, Metal
New-Old-Stock (NOS) tube.
Also known by US military identifier VT-201C.
The 25L6 is a power-amplifier tube of the all-metal type for use in the output stage of transformerless (ac/dc) radio receivers, especially those designed to have ample reserve of power-delivering bilities. This new tube provides high power output at the relatively low plate and screen voltages available for transformerless receivers. The high power output is obtained with high power sensitivity and high efficiency.
These distinctive features have been made possible by the application of directed-electron-beam principles in the design of the 25L6. The design is similar to that of the 6L6 with the difference that the 25L6 is intended especially for operation in a.c.-d.c. receivers.