Why wouldn't the amp builder skip the prinsipyo thing and build one anyways? Hindi naman art ang pinapagawa eh: it's not as if he'll design one from scratch and put his brand on it. He'll probably follow a known schematic and parts list, parang paassemble lang. He won't "build a Dumble clone", he'll just be "building an amp described in a particular schematic". And he'll be paid anyways.
Unless, of course, meron palang "selling out" sa amp assembly business Kung meron pala, edi color me clueless... I'm just taking the client's side of the situation.
And why would the builder intentionally build a Fender clone? Laftrip itong builder na ito ha.
I think the main reason is not the science, but the psycho-acoustic principle of the builder.
Here's a very good example... ZENDRIVES, ZENDRIVE CLONES & ZENDRIVE CLONE CLONES.
The Zen Drive was designed primarily to mimic a Dumble. So I assume, when you buy a Zen Drive, you cannot deny you are going for
that famed Dumble OD tone... After several Zen Drive units sold, despite being plugged to different amps, Zendrive users make accolades and such. So now, reverse engineers clone the Zendrive. In essence, they clone what is supposed to be a cheap take on cloning a Dumble amp. Then, you also have reverse engineers of Zen Drive clones.
If you were to put all these pedals side by side, would they sound the same? I bet not. But what are they supposed to mimic? A Dumble! An amp that I assume no one among us has plugged into.
I know someone who modded his Mesa Boogie S.O.B. and apparently, it was modded to have the Dumble OD tonestack. When I heard it in action, I was like
.
2 possibilities: 1) If he nailed the Dumble tone right on the head, I would be glad NOT to have bought a Dumble which cost $15,000 at the time. 2) If he did not nail the Dumble tone but followed the schematics, I would not be interested either in getting that famed Dumble tone because probably you need the gnomes and snake oil to get the tone.