I was doing some measurements and accidentally disconnected supply power with connected power input from driver. So gates got more than negative 0.5v and right gate has died.
And bigger pain is to cut the thread in it.
Let’s try to add balancing choke to the schematics — feed sources from 4 turn choke for each transistor (8 turns summary) with power connected to the central point.
BFG591 as driver.
Based on mr9120 aliexpress kit.
Plate for mrfx1k80, PTT sequencer and SWR bridge.
MRFX1k80HR5 transistor and ABLNO 96MHz clock
Photos of tube amplifiers