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Re: [Amps] IM distortion and such

Subject: Re: [Amps] IM distortion and such
From: "Will Matney" <>
Date: Sun, 25 Jun 2006 20:39:39 -0400
List-post: <>
It's according to what kind of audio amp. Guitar amps are designed to purposely 
introduce distortion. That's where the squeal of the electric guitar comes 
from. The bands actually prefer this. However, if one is an engineer, and you 
have a maximum rating curve, it is a liability to ever go outside the curve 
into the over load region. That's like saying I'll put my stamp on this bridge 
which I know is going to deflect more than allowable published tolerances, and 
that I think it can get by with the added stress, even though I am over the 
maximum curves for tensile and yield strength. Then an automobile drives over 
it and falls in the river. Who's liable? Whether electrical or mechanical 
engineering, an engineer should always look at this. Though running a tube out 
of spec probably wont kill anyone, the manufacturer better be ready to replace 
tubes or the entire amp if the customer is dissatisfied as a suit will sure 
follow if they don't. If ran in spec, one has nothing to worr
 y about, and has published data to fall back on. This from an engineers point 
of view.



*********** REPLY SEPARATOR  ***********

On 6/25/06 at 4:00 PM k7fm wrote:

>Tom said:
>"I think you are really saying an engineer shouldn't ever
>design outside what is actually published on a spec sheet
>that only covers a limited number of situations under any
>condition, even if the component manufacturer, field
>history, or direct testing show otherwise."
>It might be easier to grasp what Tom is saying if you think of audio 
>amplifiers.  Assume a tube manufacturer specifies a tube for audio 
>distortion.  However, the manufacturer of the audio amplifier is looking
>minimum distortion.  If he finds that running the tube outside of the
>specified by the tube manufacturer gives consistently lower distortion,
>it would be good engineering to do so.   In some cases, tubes might be
>selected for those parameters that met the goals of the engineer.  In some 
>cases, the plate dissipation might be exceeded to get closer to class A.
>Colin  K7FM

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