Reply noted below: 
 
 Last year I converted a RF Power Products plasma generator from 
13.56 to ~4-5 MHz for a scientific application. It had a 
questionable old tube in it, as it was pulled from another 
experiement in a different lab. When I finished, it fired up 
immediately at 1200 watts without a burp, no 'gas', no 
'oscillations', very stable.
  ****  John -- Did this amplifier employ a VHF-parasite suppressor in 
the anode circuit?
  No.
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