Coming from Mr Matney, a most excellent point of view. Particularly where
one could be sued into bankruptcy and then oblivion.
Gary...wa6fgi
----- Original Message -----
From: "Will Matney" <craxd1@verizon.net>
To: <amps@contesting.com>
Sent: Sunday, June 25, 2006 5:39 PM
Subject: Re: [Amps] IM distortion and such
> 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.
>
> Best,
>
> Will
>
>
> *********** 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
>>for
>>minimum distortion. If he finds that running the tube outside of the
>>curves
>>specified by the tube manufacturer gives consistently lower distortion,
>>then
>>it would be good engineering to do so. In some cases, tubes might be
>>hand
>>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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