[murf]

Hi guy's,
Have a weird one for you guy's.
Have 2 RCA 811k radios and they apparently are joined at the hip.
Noticed while moving one radio, if I tilted it towards me when I am standing in the front with radio playing,
the audio would cut out. Put it back up and it comes back on. Power stays on no matter where it is.
Took the chassis out and put it on the bench and it still acted the same.
Only on a forward tilt of about 45 degrees.
I flipped it up on end and commenced to poking, prodding, wiggling everything under the chassis, with no avail.
Weirder yet, is I then tried the same with the other 811k and found the same.
Built in gyrascopes or what?
Tired of tinkering with these 2 radios.
Any suggestions from the pro's?
I am thinking that maybe there is an issue with a tube when tilted.
murf