[AMRadio] Legal limit AM amplifier, homebrew

[Rick Poole]

Thanks to all for all of the wealth of information you have here.

So, it sounds like a reasonable amp would be a pair of 833's in 
push-pull running class B linear for AM and class C for CW, and 
perhaps forget the high-level plate modulation idea.  1500 watts 
output on CW and, as a starting point, shoot for 375 watts carrier 
out on AM for 1500 watts PEP at 100 percent modulation.  I have read 
K4KYV's paper on "The 375-Watt AM Carrier Power Myth" and more or 
less understand the issues, but 375 watts carrier out on AM sounds 
like a good starting point until I understand the issues a little better.

Bernie makes a good point that the difference between such an amp and 
the barefoot output of the DX-100 on AM probably will be just barely 
noticeable, if at all, on the other end.  The DX-100 is rated 100-125 
watts out on AM, and there is a general guideline that says if you 
can't increase power by at least a factor of 4, it's rarely worth 
it.  For CW, though, it will make a significant difference.  Plus it 
gets mighty cold here in the shack in the winter and I need something 
to keep the place warm.  :-)

833's at least seem to be available... RF Parts has Taylors for 
around $120... hope they last longer than the Chinese 811A's and 
572B's do... :-(

Now... where's a good place to get a power transformer and filament 
transformer for such a beast?

Rick WA1RKT