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Re: [Amps] IM distortion and such

To: Bill Coleman <>
Subject: Re: [Amps] IM distortion and such
From: R L Measures <>
Date: Mon, 26 Jun 2006 19:47:27 -0700
List-post: <>
On Jun 26, 2006, at 5:53 PM, Bill Coleman wrote:

> On Jun 26, 2006, at 6:03 AM, Tom W8JI wrote:
>> The original subject was the manual of the AL80 says to load
>> to 550mA and then as a final step back off drive to obtain
>> 400mA. This ensures the loading is heavy enough and grid
>> current is proper to handle ALC overshoots common with
>> exciters. That horrified a couple people, ...
> I don't know why. With just a little bit of searching, I found a
> 3-500Z spec sheet that clearly shows constant current curves going  
> as  high as 2.2 amps!

   Indeed.  In pulse service they will do more than that.

> (Here:<
> sheets/088/3/3-500Z.pdf>)
> So much for the claim that the 3-500Z can't pass more than 420 mA....

No one claimed that it wouldn't do more, the rub is that it isn't  
very linear above 420mA avg or 1,25a-pk.   From what I've seen, a  
3-500 can do c. a 10a pulse and an 8877 can do a 50a pulse, but that  
doesn't mean such peak currents are okay in SSB service.
> Besides, if it offends people, they can just tune their amps some
> other way.
> I don't see what the big deal is.

It isn't
> Bill Coleman, AA4LR, PP-ASEL        Mail:
> Quote: "Not within a thousand years will man ever fly!"
>              -- Wilbur Wright, 1901

Wilbur was right, Bill, man can't any better than an elephant who is  
hitching a ride in a C5A.
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R L MEASURES, AG6K. 805-386-3734

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