[Boatanchors] AM Amplifier

[Rob Atkinson]

Answer to first post:

Your best bet is to homebrew something.  Commercial ham leenyars are
usually for slopbucket and CW.

Answer to 400 watts carrier question:  Plate dissipation is the
bogeyman.  if 1000 watts total, and the carrier output is 400 watts,
good chance more than 1 KW is being dissipated in class AB.  Figure
the efficiency dead carrier at 25% and start doing the calculating for
input power with a slight h.v. sag and plate current, subtract output
and see.   You can mess around all you want with the parameters but
plate dissipation is the speed limit you can't get around unless you
add a tube or change the tubes.  Class B is different.   But 95% of
commercial ham amps are class AB.

Rob
K5UJ

On Sat, Jul 7, 2018 at 6:47 PM, Dennis DuVall <duvallddennis at gmail.com> wrote:
>
>> On Jul 7, 2018, at 3:54 PM, Dale Smith <ka5who at gmail.com> wrote:
>>
>> Lets see 450 watts times 4 =1600 watts,what is wrong with this picture.
>
>
> OK, just what IS wrong with this picture?  I run 400 watts AM carrier regularly with my military T-368.
> With the linear’s I do the same.  The amplifiers are running class B at an efficiency of 50% and thus dissipating
> 400 watts during carrier only and 800 watts on voice peaks both which values are well within he ratings of
> a 3-1000Z.  Also please note that in my home-brew unit I’m still running the same tube I originally installed
> almost 30 years ago.
>
>