SanDiego, People's Republic of California FEMA District 9
An SB-220 was meant to run at 2KW DC input that would be 3KV @ .667A OR THEREABOUTS..... As I remember the approximation formula for plate impedance is the plate voltage over 1.57 times the plate current in amps for a Class B amplifier. My calculator is on the other computer I can not ether confirm or provide any different figure.
I thought I could get rich in the stock market by investing in
Viagra, Geritol, And Ginseng but my stocks didn't rise to the occasion.
Hell, I figured that there was always somebody somewhere either trying to
Get it up
Get it going
Trying to remember what to do with it.
73 De Bubba
4 out of 5 Seniors prefer the taste of
ALPO over other leading National Brands
No biggie, but AG6K's website showed 23 turns on a Amidon 225A-2 core for 9uH. Using that data
put me below 160 meters and I didn't sweep that low with the CIA analyzer. Online calculators
show 23 turns will be closer to 11uH for that core. I ended going lower than 9uH when the dust settled.
I also did the QSK mod, loosely based on the AG6K website info... unfortunately the exact parts Rich used are no longer
available, but the RJ1a vacuum relay, and a companion Hi-G RF miniature relay, worked FB for the QSK mod. I ended up with
an inductor value closer to 6uh, based on adding about 1800pF padding across the load cap, and another 300 pF across
the plate tune C. Works like a charm. I have to give Rich credit for the motivation to do these mods. They really improved the
venerable SB-220 to a new level.