One problem using the solid state amplifiers is the horrible impedance mis-match of your load circuit. Those power amplifiers want a 50 ohm load and those old 600 watt units were bench queens spending more time on the repair bench than in actual operation. The newer model is better but with your load characteristics you'll probably still wreck it in short order. These plasma experiments are being done at many universities. What power amps are they using and do they buy them ten at a time as they get blown up daily? Reminds me of the dipshits putting new klystrons and CFA tubes in Navy radars. They require a very careful installation procedure and careful tune up. The dweebs would just bolt a new one in, attach the connectors close the door and press 'GO'. IF it worked, well good enough, if it instantly ruined the new $50,000 U.S.D. tube, well who cares, the tax payers will just buy another one.