Quoting Chip Atkinson:

 CA> As I understand it, if you increase the capacitance, the     
 CA> inductance must then be decreased (all other things being    
 CA> constant). This means that you will tap the primary coil at  
 CA> a fewer number of turns. I believe that the frequency        
 CA> equation is f = 1/((LC)**1/2) (that's 1/2 power, or square   
 CA> root).  Therefore to maintain a constant f, LC must be
 CA> constant.  Chip

True. But what we are saying (and Ed Sonderman's preliminary
experiments verify) is that as the primary inductance decreases,
the power processing efficiency of the system drops
correspondingly. This has nothing to do with tune.

It is quite possible to maintain a nice sharp tune by adding a
larger capacitor, then decreasing the primary inductance. But the
reduced inductance in the primary also reduces the system
efficiency = no real gain in system power processing. Ed
Sonderman is attempting to apply both the maximum possible
primary inducatance, and the maximum tank circuit capacitance,
using his existing coils. He wants just enough capacitance to
tune with his 14 turn primary tapped all the way out. 

If he wanted to maintain this efficiency and apply more input
power he has to reduce the secondary frequency by adding a larger
toriod, then add additional tank circuit capacitance. By fiddling
around he can add another .01 mfd of capacitance, and still have
his tank circuit in tune with the primary tapped at 14 turns.

Richard Quick

... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12