OK I now understand.
As you have already Found ESP site then dig deep into Rods fine web pages and you will find a lot of gems.
Be aware that Guitar Amps are so far away from perfect that they bare little resemblance to the Audio Fools magic smoke dealers.
The last thing you want for guitar sound is HiFi flat bandwidth so steer clear blameless amp stuff.
ODrive guitar through a dead flat EQ with 20/25khZ bandwidth is the fastest way to annoy the punters.
Some of the greatest guitar sounds ever heard were produced by what would now be considered a very bad design.
As A friend of mine found out when he spent a fortune on a custom build by a hifi teck. He eventually came to me unhappy so I built him an amp from a pile of El crap for 1/10th of what he had wasted and he was blown away by the result.
As for design help if you can find a copy of "Art of Electronics" it's well written for those of us who are less gifted at complex maths.
As noted in the ESP page you quoted, anything running below +/-35VDC is not likely to give much trouble and that covers a basic amp of 40~50Watts so 15 ~20 Watts is fairly safe.
Just wack a few ideas on a bread board and use a Light bulb limiter and see what you can come up with.
I'll try and dig up some old pictures of my testing circuits to give you ideas.
Phil.
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