Another item I've noticed with the Svetlana RF vacuum tubes is the Filament voltage. There's another observation I've made, "if" your RF Input VSWR is above 1.3:1 or higher you will develop Positive Grid Current in Classes AB1 and AB2 Linear Operation so keep the lowest VSWR between your Transceiver and the RF Input on the amplifier. I really believe to produce 1200 RF Watts Output on the Tempo 2006A, you would be required to have 40-50 RF Watts Input Drive. Into the 1990s Henry Radio set up Radio Dan to start manufacturing these same RF amplifiers but using a single Svetlana (Russian Made) RF vacuum tube which are High Mu (Gain) which would cut the manufacturing cost, not required neutralization and produce the same RF Output for a given RF Input Drive. All of these were Ground Grid and used a pair of the 3CX400A / 8874s vacuum tubes.
Henry Radio had to stop manufacturing the 6N2 because it did not meet the current FCC emission standards on 6 meters. Back then the Finals were rather inexpensive from Eimac as you weren't required to put a second mortgage on your house just to replace the valves. When Henry Radio first started selling these High Power RF Amplifiers in the 1970s, they started out as Tempo 6N2 using a pair of 3CX400A / 8874s and capable of covering 50-54 MHz and 144-148 MHz using the Ground Grid configuration on both bands. I see you've got a later version 2006A amplifier using a single 3CX800A vacuum tube in the Ground Grid configuration. You've provided some information on your Tempo 2006A 6 meter RF amplifier as far as the Grid and Plate Currents and RF Drive but you haven't provided the Plate High Voltage DC reading.
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