Based on the preamp of Traynor TS50B, Rusty Box is a big sounding circuit, perfect for bass and baritone guitars. The layout runs on 18v and has an onboard voltage inverter and voltage regulators for 15v/-15v operation. But it might work well on 9v as well but it will probably have more gain (...and less headroom) and some bias tweaking might be necessary.
Here is a quite simple Booster/Eq/light OD circuit designed by Kurt Ballou.
More info and schematic HERE.
Modified for normal DC power supply with onboard voltage inverter and voltage regulators.
The layout is based on THIS schematic.
Schematic is avaiable HERE.
The overkill 470uF power filter cap has been reduced to 100uF and the 10ohm series resistor for the power supply has been replaced with a series polarity protection diode.
A tweaked Rangemaster with switchable output filters. Schematic and more info HERE.
Here is another trace by evilarsen; Fuzzlord Drone Master.
It is essentially a tweaked Rat with a diode selector switch, a switchable twin T notch filter for a mid scoop a la Superfuzz, and an op amp output buffer.
There is two versions for this (2019 and 2020) and since they differ quite a bit when it comes to some of the component values. The internal trimpot that sets the depth of the mid scoop was only present in some earlier versions but I decided to include it here since it seems to be an useful feature.
Bear in mind that there is quite a volume drop when the switches is in silicon and Scoop mode.
2019 version
Traced and verified by evilarsen. Thanks buddy!
Not that the part numbers for Q1 and Q2 isn't fully confirmed but it is most likely BC547/8/9 types with B suffix for Q1 and C suffix for Q2.
Product description:
Soma is a tuned version of our Massif Fuzz with the tonestack of the Doom/Sludge Metal giant The Tall Font Russian.
The Massif’s circuit was adjusted with more gain and cut but still retains the open mid response to keep you above the mix. An added bonus is we added a trimpot on the inside to adjust the bias if you decide you want a sputtery hellacious fuzz, stock it’s set for maximum sustain and gain.
Controls:
Volume – Adjusts the level output
Tone – The feel of your standard BMP tone control
Body – Shifts the low/mid low range in conjunction with the Tone knob
Fuzz – Adjusts the Fuzz level
*internal trimpot – Bias adjustment
Heavy and Saturated :: Thick and Fuzzy
Per request. This is supposed to a great envelope filter with both up and down sweeps.
Schematic is avaiable HERE.
The layout is based on Brian Kepharts modernized version of this weird, fun and old device.
HERE is a link to a very detalied description of this circuit, schematic, bias setup and explenations of the small but useful modifications.
This one was quite tricky to trace. Got the topology figured out quite quickly but but identifying some of the capacitor values was quite difficult with these Greenies with faded markings. Had to look at several units, all had some minor variations but I think the layout below is pretty much spot on.
It is a heavy fuzzy overdrive with the gain control rolled back, maxed out it is a high gain fuzz. Most units had a 100k gain control with quite a limited range. It was later reworked for V4, using a 500kC potentiometer which gives a much more useful range.
It can be quite noisy with the gain maxed out (probably bcause of the layout itself, not the circuit design...) but short wires and shielded by an enclosure helps.
