DCAudioDIY.com

I think this should be the first or at least the second step in SE amp design or DIY.

http://glass-ware.stores.yahoo.net/seampcad1.html

I think it needs an XP 32-bit computer.

I bought a glassware program about 17 years ago. It doesnt run on any newer OSs.
Dont pay a penny for them.

The web page clearly states -

Product Description
SE Amp CAD
For those of you who still have old computers running Windows XP (32-bit) or any other Windows 32-bit OS.PROGRAM WILL NOT RUN UNDER VISTA OR WINDOWS 8 or any other 64-bit OS.

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I keep an old an laptop around just to run those TubeCad programs on. They're really handy. If you still have something with Win7 on it there's a free XP emulator for that.

It's a shame he hasn't had the time to update them.

If you want to move beyond the old "XP" google "spice tube models" and see what comes up. A lot of tube loving audio amateurs have done a lot of work modeling tubes and tube amplifiers using the spice circuit simulator.

You can download XP for free from Microsoft now and run it in a virtual machine:
https://www.makeuseof.com/tag/download-windows-xp-for-free-and-legally-straight-from-microsoft-si/

I haven't done this myself but I've used an XP VM someone else set up and can verify that it works!

John Broskie's programs are very helpful. As was stated, too bad he hasn't had time to update them. They run pretty well in Linux wine. I keep a dual boot machine with XP on it also, just for them.

Sure, better simulators are available, but his are simple and easy to use.