[Heathkit] Problem SB-220 (1/2 high voltage)

[Gordon Wherry]

I have a SB-220 that I only show 1/2 the high voltage 1200v in tune and 1500v in SSB.  I have changed all the diodes on the board and also the Zener.  The resistors on the board all check correctly.  This is being run off 120v.  I show between 297vdc and 307vdc on the caps.  I have run out of ideas.  Any help would be a blessing.

Thanks
Gordon Wherry (WB0WIV)