Analysis of Tetrode Amplifier

Vacuum tubes were the earliest of electronics devices and for decades they were the sole basis of the ever-evolving electronics industry. For high power transmission remains only area where vacuum tubes are still used. If we want more power in terms of kW or MW using solid state amplifiers, then much more of the transistors should be connected in parallel which makes circuit more complex. This task can be completed using single vacuum tube. So, here we are going to design vacuum tube amplifier that is tetrode based. This paper is dedicated for design and analysis of narrowband amplifier. It has maximum output power of 10kW which will be used for testing of high power transmission line components. The design of amplifier includes design of input and output matching circuit for amplifier which has to cover the frequency range of 35-65 MHz both input and output matching circuits are coaxial in nature and both are tunable to achieve desired impedance matching at a required frequency.