[AMRadio] Legal limit AM amplifier, homebrew

[Bernie Doran]

Hammond makes a nice 10V 20 A transformer. Plate transformers are hard to 
find, but there are around, someone on this should have one. Mod 
transformers are getting really hard to find. 833As turn up on ebay 
fequently.
----- Original Message ----- 
From: "Rick Poole" <wa1rkt at arrl.net>
To: <amradio at mailman.qth.net>
Sent: Sunday, November 13, 2011 9:06 AM
Subject: Re: [AMRadio] Legal limit AM amplifier, homebrew


> 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
>
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