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culturejam wrote:Just FYI, the resistor part numbering on the Gruntbox is one off from most other Muff schematics. R1 is a pulldown resistor (1M) on the Gruntbox, but on most other schematics R1 is that first input resistor (33K on several Muff versions). So just watch that if you don't use a Gruntbox PCB.

very good to know. thank you.

Dual overdrive/boost. This consists of a modified DOD250 circuit with a switch to choose between the regular silicon diode(1N4148) clipping and germanium diodes (1N34), followed by a pretty straight up Super Hard On circuit. You can use one or the other or both together, when both are on the SHO circuit follows the 250.

meathead style silicon fuzz face. I originally had a 24mm pot in but I had to swap it for a 16mm because it was too tall with the orange drops in there.


foxx tone machine with the "ultimate octave" fat/bright mod switch.. c10 (usually 3n) is on a dpdt switch that switches between 1n and 10n

I built one of those....with a momentary switch for the octave......I find it a little quiet....do you know the part in the circuit that is related to the output volume so i can get more output volume??

I would check your transistors and test for HFE if you can. I have gotten bad transistors before from smallbear NOS 2n3565. also double check the polarity of all the coupling caps. all those 10uF electrolytics.. if one is backwards you would have really weak output. Check your pinout on the transistors too. if one is backwards you would have really weak signal.

Is the volume only quiet when you hit the octave on? or all the time?

eniacmike wrote:I would check your transistors and test for HFE if you can. I have gotten bad transistors before from smallbear NOS 2n3565. also double check the polarity of all the coupling caps. all those 10uF electrolytics.. if one is backwards you would have really weak output. Check your pinout on the transistors too. if one is backwards you would have really weak signal.

Is the volume only quiet when you hit the octave on? or all the time?

i find it quiet all the time. I got 2n3565 from smallbear so maybe I'm encountering the same problem. My transistors are in the right direction. I'll check with the caps. How can I check if the trannies are good or bad??

If your dmm can test HFE you can test trannies that way. other wise just try switching them out and try to identify the bad one.

the gristleizer for dwid hellion.

eniacmike wrote:


the gristleizer for dwid hellion.

.....that is all

made this last night
momentary switch to engage the reverse setting on my rc20
and a bypass for my midiverb

comtrails70 wrote:made this last night

IMG_0115.JPG

momentary switch to engage the reverse setting on my rc20
and a bypass for my midiverb

How did you cut the square hole.

I imagine it's actually circular underneath. The corners of the square rest it atop the enclosure.

Jero wrote:I imagine it's actually circular underneath. The corners of the square rest it atop the enclosure.

ah dammnit. I'm trying to find an easy way to cut squares in my enclosures.

eniacmike wrote:

Jero wrote:I imagine it's actually circular underneath. The corners of the square rest it atop the enclosure.

ah dammnit. I'm trying to find an easy way to cut squares in my enclosures.

Feel free to share that knowledge if you do come across it I don't know to stamp holes or however they do it

Drill a lot of holes then file