[Johnson] Ranger problems

[Dale Smith]

Hi group.
   Two questions.Why would The ranger have full ac voltage on the antenna
terminals on the back with the power cord plug in ,but operate switch off.it
use to work fine.Next question,My vfo seems dead,works fine with xtals.tried
new tubes in there,the infamous resister has been changed long ago.I get
buffer current by advancing the drive control and oscillator reading on the
meter,but no grid drive.Thanks
dale/ka5who.in central NH