@brd
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Got this finished. It is a quick build from a generic Charge Pump schematic, done on vero board, the orange wire supplies +17.4 volts. I used a piece of Barry’s new Gum Wadz to hold it in place, and as the photo shows, It fits nicely behind and under a foot-switch. I remain agnostic about any benefits to playing this pedal at 18v but the owner likes it.
I was aware of the “Klingon Muff” and the excellent documentation by Cybercow.
This Pi build was imagined to be paired with a Rangemaster circuit to get that Muse Bass sound. It started as a simple plan to use 2 foot switches so the Pi and RM could be used independently, but each of those circuits have several great mods and I had a few extra switches.
I worked out the base Pi build by using an old Muff’n board and a strip of sockets. I actually A/B’d component using an audio probe as I populated the board. I added 5 extra switches before I started experimenting with the Muff’n mods. First was the Roto-Tone mid-scoop mod and I settled on 3n9,4n7,10n for the C10 selection with 10n and 4n for C11. For the Muff’n mod 3, I liked a 10k for R20 with a B100K pot. Wilkie1 was right, If I hadn’t tried it, and gone outside the box, I would not have found those values.
In my opinion, most of the sounds you can get from these 2 tone stack modifications can be had with the Tone Tweq mod. I used that for my last Muff’n build and liked the results. For this build I wanted to have a switchable set of values as opposed to having to dial in the sounds, so I opted for the individual mods. I can detail the whole build in another post if there is interest.
Thanks again for the help, this is a great forum.
They look a lot like these. I purchased these from Small Bear years ago and were sold as “point three +”. I believe I got 3 matched sets out of a lot of 10. I don’t have notes on which builds they ended up in except that the last set measured around .35 and were recently used in an MKC build that sounded sweet. I have also been looking for replacements, and just purchased some Amperex brand from Small Bear that were advertised as high V fwd. I haven’t had time to test them yet and I doubt I have the resources to measure and produce a diode curve tracing chart for them. I have an Atlas DCA55 and a Fluke meter, if there are any measurements you would be interested in on any of the diodes, just let me know.
Thanks, that is very helpful Wilkie, There are a couple pedals I want to try this on and I have some extra 1044’s to breadboard a quick test circuit. If it works, I’ll try to build it.
