What's on the workbench?

[Teddeeh]

I had thought the PCB Guitar Mania offering was a copy of this pedal, but you're right, it's a preamp based on the head.

I'm in no hurry, I have more projects on the go than I can poke a stick at. I am glad to hear that it's in the queue though

Can confirm the pcb guitar mania is NOT the mxr 5150. Theres not much gain to it.

the mxr 5150 is the teeeeets. So is the diamondhead. That was a complete shock- i got it on a whim for cheap and blew me away. The demos online just havent done it justice. Maybe wes hauch’s. But still didnt sound like what it can do.

 

[Grubb]

So is the diamondhead. That was a complete shock- i got it on a whim for cheap and blew me away.

One for the Wish List on here?

 

[Robert]

One for the Wish List on here?

It's already in queue to be traced.

 

[Wizardofwoz66]

I might be wrong, but I don't think the board offered by any of the other guys is exactly the same as the MXR. I believe those are JFET adaptations of the amp schematic.... This is (quite) a bit different. This has opamps, and more opamps, and what's that? Oh.... more opamps.

Not saying that's better or worse, just not the same.

(If there IS a schematic of this thing already floating around I'd love to see it, it could sure save me some time)

It's going to be a little while, that circuit is rather complicated, but I did crack it open a few days ago to put it in queue.

I made the PCB Guitar Mania version of this and was highly disappointed in it, though now there is a modded version of the build doc claiming that it actually gives it some high gain sounds (lots of complaints on the original board that it was essentially just an overdrive, certainly not high gain). I haven't gone back and switched out parts to see if they actually fixed it, but theirs certainly uses a bunch of op amps and no JFETs, not sure how it matches up to what you've found: https://pcbguitarmania.com/product/wolfgang-5051/

Edit: It has two JFETS, an input buffer and maybe the second is an output buffer of some kind? A little strange, it's right before the EQ section and the last op amp, which I would assume is acting as a buffer as well.

That being said, I'd like to build this again and see how it sounds from a better source lol

 

[Robert]

I'm still in the process of tracing it but I'm far enough in to say that these are two completely different circuits.

 

[temol]

Wolfgang = Bajaman's EVH overdrive. It's definitely not a high gain pedal. Both jfets act as a buffers.

BAJA EVH overdrive pedal project 090218

Here it is at long last - the Peavey EVH 5150 preamp section in a nice friendly 9v overdrive pedal format. You can build it with or without the tone stack and recovery stage or make it switchable - the choice is all yours :wink: This circuit is my

www.freestompboxes.org

 

[Robert]

To be fair, the MXR is called the "5150 Overdrive" as well, but it's definitely high gain.

These days it seems the line between overdrive/distortion is so blurry they just go with whatever sounds catchier in the name.

 

[Chuck D. Bones]

My review of the PCBGM 5051 schematic is a big thumbs down. Looking fwd to a much better board from PPCB.

 

[Robert]

 

[JamieJ]

This is badass! That John Mayer preamp is just asking for a PCB now

 

[Chuck D. Bones]

Glass-FETs!

 

[Robert]

Glass-FETs!

Reckon we can emulate the sound of real JFETs using tubes?

 

[carlinb17]

Put me down for a pre-pre-order

 

[fig]

Put me down for a pre-pre-order

Bar-keep!

 

[Chuck D. Bones]

I hope you're also working on boards for EL86, EL84 and 6L6G.

 

[fig]

I foresee a warm glow on my bench. Hot dang!

 

[carlinb17]

i love the smell of cooking tubes in the morning, it smells like victory!

 

[Robert]

 

[Dan0h]

Yes yes yes yes yes. Where is the preorder button!!!!

 

[Chuck D. Bones]

SCHWING!