[Amps] HeathKit SB-220 Tank Circuit Inductance

[Bill Smith]

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