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Fwd: Re: [Amps] TL922A and AL80A

To: <amps@contesting.com>
Subject: Fwd: Re: [Amps] TL922A and AL80A
From: 2 at vc.net (rlm)
Date: Wed Mar 19 21:46:17 2003

>> In working on the AL80A, I got a manual where I found out about the 400mA
>IP
>> limit.  I am certain that I was running the other AL80A much higher than
>> that.  While the amp did not malfunction, I was concerned about the
>quality
>> of my signal. Hence my question about the limits.  If 400 mA is the real
>> advisable limit for signal quality with one 3-500, then the TL922 is
>> probably the better choice.  If the TL922 can be run in CW mode in the SSB
>> position (several have told me that they do this all of the time) then the
>> TL922 is definitely a better choice than the AL80A as a backup and there
>is
>> no point carrying amps down and back.
>
>The AL80's have a good reputation, are reliable, 

**  Except for the bandswitch.

>

>and are definately not
>"splatter boxes" even when pushed a bit beyond ratings.
>
**  When a single 3-500Z is driven by 100w, IMD is not good.  

>The "400mA limit" is not a point where suddenly you will have major
>splatter. It is the SLOPE of the operating load-line that determines the
>production of harmful IM products, not the fact a line starts to change into
>a curve.

**  In analytic geometry, one learns that when the slope of a straight 
line begins changing, a curve results.
>
>You can find this discussed in Care and Feeding of Power Grid Tubes by
>Varian, ...

**  Not in my copy of "Care and Feeding ..."

-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
end

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