[Amps] HeathKit SB-220 Tank Circuit Inductance

[Bill Smith via Amps <amps@contesting.com>]

Has anyone measured the total Tank Circuit inductance of the SB-220?   I have 
read that it needs to be doubled in order to use it for 160 meters.  I used 
online Torrid Core calculators to estimate it using the recommendations in 
AG6K's article but 14 turns on a T-225-2 powdered iron core doesn't seem to be 
enough inductance.  Maybe I am missing something.73 and thank you,Bill KO4NR
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