[Amps] amp with push-pull output and magnetic coupling to the antenna

[Gene May]

I have two related questions relating to the subject above, and would appreciate advice.  In more detail:  I am beginning the design of a 160 - 10M amplifier that will be cathode-driven, push-pull, probably use tetrodes (tentatively 4CX600J's) and couple the tubes' tank circuit to the antenna circuit with what is often nicknamed a "swinging link".  A "swinging link" would couple the antenna circuit coil magnetically to the tubes' tank circuit by having the antenna coil on an arm that swings or meshes in and out of a gap in the tank coil; the amount of coupling is varied and mechanically adjusted by changing how far or deeply the coils are meshed together.  Around fifty years ago and more, this was a common technique.  However, as many readers of this probably know, it is, ah, "uncommon" now.  I have looked far and wide for the mechanical components to accomplish this, unsuccessfully.  Now the specific questions:
 
1.  Does anyone know of a source for components or parts that could be used to make such a system?  I am willing to consider taking it/them out of existing assemblies (e.g., military surplus) but would prefer assemble it from "basic" parts.  I won't go so far as to say I'm desperate, but after considerable looking, I am very flexible and open-minded.
 
2.  It is necessary for the Q's of the tube circuit (probably to be around 10 to 15) and antenna circuit (probably to be around 1) to be compatible with the range over which the coupling coefficient between the two coils could vary.  As I understand, it is difficult to impossible to get coupling coefficients higher than about .3 using coils that would be compatible with the voltages and currents associated with an output of 1.5 KW.  Comments, please?
 
TNX ES 73,
 
Gene May
WB8WKU