"Bob" wrote in message
...
Never mind, found it!
http://glowbugs.net/AirDux.pdf

Would it be a correct assumption that the vari-pitch Air-Dix coils were used
with whatever-the-then-common variable capacitor was to achieve linear tuning
(...I realize that over time capacitors were purposely made to have non-linear
capacitnace with respect to dial position to achieve this as well...)? Or
something else?

I like the 1957 prices. :-)