One side of each cap is connected to chassis. You will have continuity across each tuner since there is a coil across them.
http://www.nostalgiaair.org/PagesByModel/798/M0040798.pdf
You will have some continuity between B+ and chassis through resistor dividers and maybe leaky bypass caps?
Norm
:Hello all, Are all air var caps isolated from the chassis, this model 73 air cap is grounded to chassis with 3 mounting screws, no rubber, I can't figure anyone not putting rubber back in, I have a grounding problem and traced it back to the air cap.After removing the air cap I no longer have contiuity between the plus and neg wires.The stator and rotor are now isolated, do you think I should isolate? Thanks George