[murf]

Hello fella's,
Have not visited for a while as summer is now here.
Have a nice RCA 811k that I re-capped and it has an issue that is driving me nuts.
Plays well except on the lower half of the band. There I get backround noise and static in between the stations as well as a smaller amount while tuned in to the station.
Higher end of the scale is fine.
Seems like an alignment problem, but I get no response from any of the upper adjusters or the lower adjustments under the chassis.
Have re-capped etc. and checked and  swapped the tubes for others.
Found that if I connect a ground wire, it gets a little better on the lower end of the scale. Makes no difference on the upper end of the scale.
Otherwise works great. Very good reception on am and shortwave bands.
Any RCA experts out there that would have a clue?
May be picking up a couple more of these tomorrow as well as an 813k, so I need to get educated on these.
Thanks in advance,
murf