[Amps] AL-811 low power

[R.Measures]

On Nov 27, 2004, at 12:57 PM, W5WRL wrote:

> Folks
>
> I have an Ameritron AL-811. I get very close to 550 watts on 160m but 
> as I
> move higher in frequency 40m to 10m the power output falls off. Output 
> on 10
> is about 250w. One fellow suggested that I change the tubes.

It's not the tubes.

> I replaced the
> original 811s with 572s and the result is basically the same. I am 
> driving
> the amp with a Yaesu 847.

>
> Any suggestions on how I can get full power out of the amp on the 
> higher
> frequencies?

Part of the problem is that as freq. increases, the tank conductors are 
not large enough to compensate for skin-effect.
>
> Best Regards,
>
>
> Bill Lawless - W5WRL
> Frequency Coordinator - Zone 5, West Texas
> http://www.txvhffm.org/default.asp
> ARRL WTX Assistant Section Manager
>
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org