[AMPS] SB-220 Conversion Confusion: Inductance

[gdaught6@leland.Stanford.EDU (George T. Daughters)]

Hi all,

> >> Two tubes requires that L be cut in half and C-tune be doubled to
> >> maintain the same Q.   Guessing at tank values is not good engineering
> >> practice.  

Right.  And reducing the number of turns from 3 to 1.5 doesn't 
reduce the L by 50%.  In general, halving the number of turns in a 
coil reduces the inductance by a factor of four.  L is proportional to 
N-squared.

73,
 
George T. Daughters, K6GT

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