2 – 2c39 1296Mhz amplifiers. Each amp is capable of 150 watts air cooled or 200 watts each water cooled. They can be combined to output 400Watts. They require 1 – 2c39 each and a filament and plate supply to operate.
http://www.ham-radio.com/n6ca/appnotes/1296hybrid/1296hybrd.html
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