Chris, something else has been bothering me about SY's approach and conclusion but I haven't been able to quite put my finger on it until just now.
In addition to the numerous problems already covered, there is an even deeper, even more fundamental problem: it is inconsistent with the principle of superposition.
In addition to the numerous problems already covered, there is an even deeper, even more fundamental problem: it is inconsistent with the principle of superposition.
Well, I'll ask again- what's this mysterious pair of loads which cause my model to give incorrect results?
Any pair of loads.
Show me a simple schematic of any two grids that simultaneously drop to zero
when driven by a Concertina. Done, put a fork in it...
A grid load is, for most concertina applications, a high resistance (the grid leak) in parallel with the input capacitance. I've experimentally confirmed that my model gives accurate results for that.
You may be confusing what the concertina drives with how one defines Thevenin source impedances for each of the output polarities (open circuit voltage divided by short circuit current- neither of these is normal operation for any amplifier).
Yes Alfred, I've considered Superposition. But if he ignores Thevenin, why would he pay any attention to Superposition?
Indeed!
SY, it certainly is, and we've explained why. You've simply ignored it.
Sorry, I've read every post in this thread and I have not seen where you have disproven his work. You are attacking his derivation of the model, but simply have offered no rebuttal of his data. He's killing you.
Killing me, leadbelly? With data from bad models? Just tell me one thing: how does the (two-node) Thevenin theorem possibly, conceiveably, by any stretch of the imagination, jive with an impedance that is measured by shorting three nodes together?
Why in the world, leadbelly, would anyone give any consideration to data obtained from bad models? Should I pay any attention to somebody who wants to refine the Ptolemaic model of planetary motion with new data?
Experimental data is data, period. It doesn't come from a model. The model is used to explain the result. So, if you want to disprove SY's model, show how the data also fits your correct model, or instead fails to cover part of the experimental space.
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