Marshall Shredmaster

 Here's another old layout redone for all you Jonny Greenwood fans. I think the old layout was based on an old and incorrect schematic (here's the schematic used for this layout), but this one should be right and a much easier fit in an enclosure than the old one. 

Marshall Guv'nor

Here's another layout that needed a refresh/correction. Old layout was pretty trash and had a few errors which have all be resolved. Similar to the Blues Breaker (at least in circuit topography), but with a 3-band EQ and hard clipping. Bit more gain and distortion on tap. Here's the schematic for reference. Should fit nicely in a 1590B.

Marshall ShredMaster

Here's another one from Marshall's great pedal line from the early 90s. When it was released it was considered a high gain distortion, though probably wouldn't be categorized as such today. It was made famous by Thom Yorke and Jonny Greenwood from Radiohead and covers more than just shredder territory.

Marshall Guv'nor

The Marshall Guv'nor is one of the more highly regarded overdrive/distortion pedals of the late 80s, early 90s. With it's amp-like dynamics and a wide range of versatile tones, the Mk. I version of this pedal is still highly sought after. Many artists have used it, though Gary Moore is most associated with it, thanks to his "Still Got the Blues" album. 

You can use right angle PCB pots, mounted from the solder-side of the board if you like. It should fit nicely in a 1590B.

Marshall Blues Breaker Mk.I

The Blues Breaker was designed to emulate the vintage 2x12 Marshall combo, and was introduced by Marshall in 1991. Great at pushing a clean amp into breakup and sounds great with single coils. There has since been a Bluesbreaker II, which many claim to be inferior to the original. This layout is for the original model with onboard pots and will fit in a 1590B.

Note that the PCB layout is half a row (0.05 in/1.27mm) taller than the perf layout.

1590A Tone Bender Mk.II

Here's the mighty SolaSound Tone Bender Mk.II shrunk down to fit in a 1590a. I laid it out for NPN transistor, as I really wouldn't want to try and squeeze a charge pump in a 1590a along side the effect board. Like the larger layout I posted last year, you could build the Marshall SupaFuzz with this layout as well. See that post for info on the value changes.

Update 3/22/15: I was trying to build this one to verify it and realized I'd forgotten the feedback resistor that goes from the base of Q2 to the emitter of Q3. The layout above is updated and should be fine now.

Sola Sound Tone Bender Mk. II Professional

Here's another layout with onboard pots. The Sola Sound Tone Bender Mk. II is probably most famous for shaping some (but not all) of the guitar sound of legendary guitarist Jimmy Page on Led Zeppelin I. Originally it was a positive ground effect, but I've laid it out to use NPN transistors. This way you can daisy chain it with normal negative ground effects, or avoid using a 9V battery or making a voltage inverter. I've added a polarity protection diode and a pulldown resistor at the input. I would also recommend as I did with the Fuzz Face, to swap the stock B1k pot controlling attack with either a C1k or B2k pot for better control.

The hfe of the transistors should be around 70 for Q1 and 2, and 100 for Q3 (according to Fuzz Central). I've personally had good luck with some Russian MP38a transistors. You can also build the Marshall Supa Fuzz with this layout by making the following substitutions:

• Increase both 4.7µ capacitors to 10µ
• Reduce the 100k resistor going from the base of Q1 to ground to 10k
• Reduce the 100k resistor going from 9v to the collector of Q2 to 47k

You can also use this layout to make the original positive ground effect using PNP transistor by just inverting any polarized components (basically just flip around the 3 electrolytic caps and diode).