[Kenwood] TS-830 unstable ALC and burned R37

[James Barrie]

ok, this is a continuation of the unstable drive issue with my 830.
  thanks for the advice on how to get to the bottom of RF board.
  I replaced the burned up R37 and the high R36 and fired up the rig. 
The unstable drive
  continued and while in the tune position, R37 went up in smoke again.
  Checked all the voltages on the 12BY7A while on receive and transmit 
and found the
  following:
  screen is 234 on receive and 191 on transmit
  grid : - 44.3 - receive and -4.93 to - 7.63 transmit
  cathode: ZERO on receive and 1.6 to 1.7 on transmit

  also checked R34 (99.8K), R41 (69.7), R35 (112.3) and R27 (387.9).
  The 12BY7 was tested good on a tube tester, but that may not prove 
anything ....
  Still getting 125 watts output.
  Anyone have any suggestions as to why the grid is not going positive 
and the cathode is
  not getting to 4.6v? Or is there another reason for the unstable drive 
and large current
  through R37?

  thanks,
  Jim
  WA8SDF