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Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier

Subject: Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier
From: R L Measures <>
Date: Fri, 23 Jun 2006 15:40:41 -0700
List-post: <>
On Jun 23, 2006, at 10:06 AM, wrote:

> In a message dated 6/23/2006 10:24:41 AM Eastern Daylight Time,  
> writes:
> 85w will drive a 3cx1200A7 to the point where it is beginning to run
> out emission.
> > ...
> R L MEASURES, AG6K. 805-386-3734
> Hmmm,  there is quite a significant increase in the output power of  
> this particular amp (AMERITRON AL-1200) between 85 watts of drive  
> and 100 watts of drive,

How much anode-I?

> so it seems that the tube continues to make power from 85-100 watts  
> of drive. At that point (100 watts of drive) the grid current is  
> about half of the maximum permissible.

There is no max grid-current rating for the 3cx1200A7.

> I contend that the amp would continue to make power right up to the  
> maximum permissible drive level of 130 watts.

3-500Zs will continue to make more power up to about 550mA of anode  
current, but they begin to get non-linear c. 420mA.

> quote from Ameritron AL-1200 operating manual "maximum permissible  
> drive power 130 watts"
> Ron, hook that baby up to your FT-1000 and run it up with 130 watts  
> and let us know what it does.

R L MEASURES, AG6K. 805-386-3734

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