[Amps] IM distortion and such

[R L Measures]

On Jun 27, 2006, at 10:12 PM, Peter Chadwick wrote:

> Tom said:
>> Even a curved line does not necessarily produce
> IM3 or IM5. (harmful IM3 is 2 * F1 - F2,  or 2*F2-F1, IM5 is
> 3*F1-2*F2, 3*F2-2*F1 and so on through all odd-order
> products).<
>
> If it's a square law curve, for example, there are NO third order  
> products (at least from that stage). Then again, some curvature can  
> lead to cancellation and an improvement in IMD at some power level.

RE: constant current curves:  I do not believe that a constantly  
changing slope (i. e., a curved line) has this magical ability. .

> The data sheet absolute maxima are the ones that really count -  
> exceed those, and you can have problems getting warranties honoured.

How would the manufacturer determine how much peak current had ever  
been emitted from a directly-heated cathode?

> (Cynicism suggests getting warranties honoured can be difficult  
> whatever you do...)

Not from Eimac when Eitel and McCullough ran it.
>
> Note ... ... ...

R L MEASURES, AG6K. 805-386-3734
r at somis.org