> > 1. select an appropriate circuit modeling program
>
> Why model when you can measure?
>
> > 2. construct a model of the tube in question, parametizing
> manufacturing
> > variances
>
> Why model when you can measure?
>
> > 3. construct a model of an amplifier circuit in question, parametizing
> > component tolerances
>
> Why model when you can measure?
Determining by measurement that one instance of a circuit fails to oscillate
does prove false the assertion "every instance oscillates". But the domain
here is production, where there are hundreds or thousands of such instances;
one cannot measure them all.
The question is whether, with some combination of reasonable parameters,
some instances oscillate. Modelling is a pragmatic way to answer that
question -- it allows evaluation of the multiple combinations of parameters
likely to be encountered during a circuit's production.
Models and modelling results can also be shared via the net, permitting
independent verification.
And before anyone gets suspicious, I have no relationship with any company
producing RF modeling tools.
73,
Dave, AA6YQ
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