Vacuum Tube - 6L6GB, Beam Power Amplifier
New-Old-Stock (NOS) tube.
Also known by US military identifier VT-115A.
The 6L6GB is a beam pentode designed primarily for use in audio-frequency power amplifier applications where relatively large power outputs are required. In addition to high power output capabilities, the tube features high power sensitivity, high efficiency, and low third and higher-order harmonic distortion.