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I have knowledge of how a guitar amplifier works, and have even designed schematics for tube amplifiers. Even though the general layout (input—>preamp—>fx loop (if wanted)—>power amp—speaker out) is kind of straightforward, what could I add to the circuit to make my design sound different from others?
Example(s): If I’m making an EL34 amp, make it sound different from a Plexi, JCM800, Hiwatt Custom 100 or Vox AC50, if I’m making a 6v6 amp, give it a sound different than a Fender Twin/Deluxe Reverb/Champ, or if I’m making a 6l6 amp, sound different from a Fender Hot Rod Deluxe and Mesa Boogie Dual Rectifier.
 

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EF86 preamp tube into a 2 or 3 band tone stack (not a 6 position switch) and then into a parallel SE power section (so no PI), with a variety of power tubes. I don't know if it'll sound any good but I'm not aware of anyone building that config. But maybe there's a reason for that.
 

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EF86 doesn't like traditional tone stacks, loses too much gain. It's either a switch or a few variants of a simple tone knob. I use a cathode follower after the EF86 a la Marshall, Fender Tweed, Vox, then into the tone stack. IMHO what makes amps sound different is in what order the signal blocks are arranged, ie gain, tone, cathode follower, gain, PI or another order. Also which PI is used has a big influence on tone. Orange uses a different PI than Fender and others and sounds unique. Many, many ways to "skin the cat".
 

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To a certain extent it's all been done. Depends on how different you mean I guess. For me, to sound completely unique, it's going to be so different that some will think it is broken.
Otherwise, a little different and some will just think 'sounds like a variation of (insert brand & model here)'.

One thing I did think was quite unique were the Philips tube hi-fi units that did not use output transformers but used custom high impedance speakers instead. Now that is something.
 

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I'm not good at recognizing sarcasm sometimes... this is one of those times.
This is a real thing?
Lol. It sure is (a real thing)!

Like JBWelder said:
...to sound completely unique, it's going to be so different that some will think it is broken. Otherwise, a little different and some will just think 'sounds like a variation of (insert brand & model here)'.
 

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A unique sound that is GOOD would be my choice, Doug.

GOOD = rich, clear, responsive, articulate, variable.

Otherwise, yeah, may as well "go-with-the-usual." I guess.
I have about as plain vanilla gear as possible -- tele and deluxe reverb . I set both tone controls at 5. And I still sound just like me because a) it's in your fingers and b) that setup sounds like me.
 
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