Russian tube 6P3S-E REFLECTOR factory, output beam tetrode. Best quality, the sound is nice - authentic vintage tone. Near equivalent: 6L6, 6L6GT, 6L6GC and 5881
Power triode tube GI-7BT is designed to generate and amplify oscillations at frequencies from 300MHz to 3000MHz and with a power of up to 11kW. Comes with a radiator.