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Thoughts...

The only way to know which circuit is best is to build it up and listen. The Sziklai is more "linear" because it has forward gain inside the loop that increases the amount of feedback. If you think this will make the amp sound better, I've got a Crown DC300 I'd be glad to sell you. I don't like bootstrapping on general principles, so I haven't ever tried a circuit like this (and don't plan to), but I could be wrong. Maybe it's the best sounding thing since Edison invented the gramophone. You'd have to build it up and listen to find out for sure.

You've already found one problem with the first circuit, namely the fact that it only put 0.7 volts across the first transistor. Look at any of the transistor curves, and you'll see this is not a good way to run a transistor. 2 or 3 volts might be OK, but not 0.7 volts.

I use simulations about once a year, but usually spend nearly all my development time on real circuits and listening tests. It's the only way to know how something is going to sound.

Good luck,
Charles Hansen

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