[AMPS] Blown TL922A... What to do?

[Peter Chadwick]

Dave says:

> 1. select an appropriate circuit modeling program
>
>  2. construct a model of the tube in question, parametizing manufacturing
>  variances
.
 > 3. construct a model of an amplifier circuit in question, parametizing
>component tolerances
>
>  4. discover combinations of parameters, if any, under which VHF
>oscillation occurs
>
>5. construct models of alternative VHF oscillation-suppressing circuits,
>and evaluate their effectiveness and side-effects


The question is how long this will take - especially 1.

Modelling is a very good tool - if the model is right. 'Ay, there's the rub'.

At an international standards meeting, one American guy made a very profound
statement: ' Simulation is like masturbation - the more of it you do, the more
you prefer it to the real thing'. There is a lot of truth in the thought behind
that statement.

73

Peter G3RZP



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