Dual Plexi / October & JCM800 Build

[tristanc]

Just sharing my latest build. My first to use a set of modular PCBs I designed to allow quick and easy design changes should I wish.

The modules are for Preamp, LTPI, Effects Loop, Reverb, Tone Stack and Power Supply. I followed a fairly anal grounding scheme, keeping chassis and audio grounds separate throughout & filter caps close. As well as trying to keep the PCB layout as close to an ideal point-to-point style as I could. I'm going to make the KiCad files and Gerbers available on GitHub or similar so others can take and modify / use...

This is an AX84 October & JCM800-style build using a pair of 6V6s, with two inputs as suggested in Sluckey's Dual Marshall. I made a few tweaks here and there based on Merlin's books and used his Bone Ray tone stack as well as the 'Scale' control he describes.

I also added a solid state effects loop and internal reverb using a Belton module usually seen in pedals.

The goal was for a loud amp that takes pedals reasonably well for use with a band. I think I've achieved that. The reverb works really well. It's loud. And a bit of boost in front makes the JCM 800 input scream. The October input gives lovely cleans.

I've a new set of 6V6s incoming and will do some preamp tube rolling, but won't spend too long on it as it's pretty much there.

Schematics and BOM: https://www.tristancollins.me/ax84/Mutineer/Built/

Tristan

[Auke Jolman]

Nice build. Something different as to what we see mostly here.

Where did you buy the PCB's?

[tristanc]

Where did you buy the PCB's?

Thanks for the kind words.

PCBs are all made by PCBway in China. I kept the sizes to below 100x100mm so they are $5 for 10. That way you can make up an entire amp for very little money! I've a few left over which I'll be wanting to get rid of soon.

[MakerDP]

Nice work Tristanc!

Someday I will build an October... some day...