Phil does (or should) know what he's talking about, at least when it comes to guitar tonestacks - it's his
thang.
But to keep the party going, there is
Rod's Project27, a nice little preamp (and it comes with a PCB and support).
The one that grew out of my rant; which can be treated as a bunch or basic building blocks; power supply, and gain stage(s), tonestacks
ad lib - experimental, but that's what this was for. The core is the gain-settable hybrid FET/BJT gain cell, similar to but better than a 12AX7 stage.
Now some observations on this;

What we have here is another hybrid where the Drain load resistor has been replaced by a constant-current source. So in fact only two devices, the lower FET's, are really needed for amplification.
Using a current source load has applications, and one is where you are trying to get MAG - Maximum Available Gain. In theory this can only occur when the Drain resistor is infinite (so the supply voltage has to be also). A constant-current source or sink approximates this condition until the real supply rail is reached (then
The best-laid schemes o’ mice an’ men, Gang aft agley,)
But with a limited voltage headroom the last thing we want when a guitar can produce a volt peak, is MAG! So this first stage must not have a gain higher than the supply voltage or it will clip; 18VSUP, 1 volt in, gain of x18 just clipping.
We must always consider how our gain is distributed around tonestack losses and amplitude controls like front end Gain and back end Master volume controls, and look for unintended interstage clipping - in a word "headroom".
If this pre was billed as "fully-cranked" or something other than "Blackface" (or Marshall or Vox or whatever) I might not mind so much; if the creator had just had the guts to say "here's what
I've done - this is
mine". Then he could
own his poor engineering.
AND - I don't like circuits that only have identifiers and no values. Lose the table and the circuit is useless. Or maybe that's the retentive idea. {Poetic justice really - it will just decay away into digital dross.}
You can read all sorts of stuff on the net, but really, what you have to do is buy a handful of components, build a "breadboard" test rig, and start building and auditioning stages, modules, sections; get
LTSpice (free) and learn how to build circuits in it, and
Tone Stack Calc is fun and useful.