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The most hassle-free way of doing it is simply taking the Fender twin schematic and changing the tone stack values to those of the JC120. But... Which JC? There are at least 6 or 7 iterations of it, sometimes with significant changes. The only thing in common between versions is the huge...

No wonder. I find it really weird that designers stick FMV tone stacks in pedals that are meant to go into amps that already have an FMV. You end up either having to fight one of the two tone stacks, or get lost in the mix due to lack of mids...

No compromise. Our vision, our knowledge, our blood, sweat and tears, to bring you the unadulterated tone of the gods. Build now or cry later. https://docs.pedalpcb.com/project/ChatGPTImage-PedalPCB.pdf

FWIW, comrade @HamishR just posted a vero layout for the HD130 :) https://forum.pedalpcb.com/threads/music-man-hd-preamp.29410/

I'm quite fond of this preamp, it was one of the first I built on vero 10+y ago. "Don't Fear the Reaper" by BÖC was recorded on one of 'em. Joan Jett, The Clash, what have you... Johnny Winter's settings on the HD amp were: Bass 0, Mids 0, Treble on 10, Gain on 10. Talk about bright. Yet it...

The Musicman HD130 is an SS classic that's fairly easy to build. There was a DIY project for it on the EAE page, if I remember correctly.

Ya still can, schems are available online. I have breadboarded all three, with good results.

FWIW, there are a few commercial amps that feature specific emulations of tube poweramp dynamics: - The Traynor DG60 and DG65 have an LM13600-based compressor with moderate clipping, - The Ampeg SVT-8 pro has a full sag, dynamics and crossover distortion emulator as last stage of the preamp...

It is actually closer to the first version of the Lead 12 (minus diodes). Marshall did several revisions of those circuits and I get the feeling that the official schematics might not be 100% accurate:

I'd also change the 4558 opamp to an LM1458, those little buggers overdrive in a much nicer way :)

Should be fairly easy to turn this into a Marshall 3005 clone, it has the exact same building blocks...

IIRC that kind of contraption is from back when engineers wanted to make sure that an opamp would be able to drive low loads. This can also be found in the Intersound IVP preamp, or some early 80's Fender circuits. You could safely remove the transistor push-pull stage and use any decent opamp...

Right, if I understand your question correctly... The way I see it (and I could definitely be wrong), they basically merged two different stages, a Multiple Feedback Filter, and a simple highpass inverting gain stage. Clever way of saving one half of an opamp by having both frequency manglings...

I'd bet me pinkie that it's simply to compensate for the fact that the whole preamp before it is lacking in lows and quite bright as is. As such, you'd need a nice, hefty bump at 100-120Hz, a scoop across all mid frequencies and just a gentle hump on the higher freqs to more closely resemble a...

On the top circuit: you are missing a resistor to ground at the positive input of the first opamp. Won't work well as is. Bottom circuit: as Scruffie said :D

Peavey Bandit silver stripe, clean channel, bright off. Going into a scavenged and gutted Fender frontman 2x12 open back cab, containing a G12T75 wannabe (EHX's sneaky copy of it) and a WHS greenback wannabe. Tone stack is similar to Bassman, which is to say halfway between a Marshall and DRRI...

Si quieres encontrar a alguien que te haga la faena, te va a salir más a cuenta postear en inglés, amigo... Con la de herramientas en línea que hay para traducir, no debería de suponerte mucho engorro ;)

EXTRA clipping/distortion. More harmonic complexity and compression, etc.

Technically you could mimic any amp with a plexi topology: laney supergroup, sunn model t, park, traynor yb-something to name a few. Careful spice modelling will be required, though.

Unless there's a vactrol in there. Then a lenghty debate about light exposure and the LDR's ISO ensues, and nuthin gets done.