Tesla Cannon Fuzz

Exciting news!

I have added a page for another addition to my ‘Standard’ line of pedals that I build; the Tesla Cannon Fuzz!

I have been building this circuit for a while now for my clients, and have tweaked it to the point where I feel it meets all the requirements, and tonal characteristics, I look for in a Muff style pedal. I really love this pedal, and I hope you will too.

More info can be found here: https://sj-effects.com/pedals-for-sale/tesla-cannon-fuzz/

You can also navigate to the Tesla Cannon product page using the pedals menu above.

I will be uploading more sound demos (and a video) soon.


Night Shift (Maestro Stage Phaser Clone)

Another recent build here.

Maestro Stage Phaser clone built on one of Madbean Pedals PCB’s.

I went for a slightly different look on this one with the black and white graphic which I think came out cool.

It’s sounding great; really nice ‘chewy’ phaser tones, and a nice variant from the usual Small Stone/Phase 90’s etc.

It sounds great on guitar, and also sounds great on keyboards, synths, bass etc.

Night Shift Phaser 1

Night Shift Phaser 2

‘Muck Monkey’ 2in1 Tesla Cannon

This is another custom build that I recently completed.

It’s a 2 in 1 pedal, with two Tesla Cannon circuits running with Master + A/B switching.

The two Tesla Cannon circuits (based on the classic Big Muff) were tuned slightly differently; one slightly ‘hotter’ than the other for higher gain.

I used  BC184 transistors (hand selected for the right gain) for the lower gain rhythm channel, and 2N5088 transistors for the higher gain lead channel (again hand selected).

The higher gain circuit is more suited to lead playing and the lower gain circuit more suited to rhythm etc. work.

Both channels are very flexible though and can be used for a multitude of tasks; the mids knob really helps in this regard.

The pedal was hand painted at the request of the customer. I have not done this for a while (I usually use decals/labels), but I was pretty happy with the end results. I should get the old paint brush out more often!

It sounded great when testing, and the Master + A/B switching that the customer requested was a good idea as it allows you to go from clean, to rhythm to lead very easily.

If you are interested in a build similar to this just send me an email and I will get back to you ASAP.
Hope you like the pics, but no ‘gut-shots’ for this one unfortunately, as I was so eager to ship the pedal I forgot to take any!

Muck Monkey 2 in 1 Pedal.

Muck Monkey 2 in 1. The picture also shows the ‘case candy’ I ship with each pedal. The envelope includes (brand new) SJ Effects Picks, Manual, stickers etc, rubber feet etc.

The Hummer (‘Mayo’ Style Big Muff with Mids knob)

Another day, another Muff  😉

This is a custom Tesla Cannon that I built for a guy who loves his Skreddy Mayo, but wished it had more control over the mids, and a tad more gain on tap.

He is also a massive Smashing Pumpkins fan (as am I for that matter), so the name came from him.

The PCB is my standard ‘Tesla Cannon’ circuit, but with some tweaks to get a tad more saturation and gain going on (larger coupling caps, lower value emitter resistors etc.).

I also used 2N5088 transistors (I usually use BC184C’s or BC550C’s) in this build to bump the gain up even further. The transistors were hand selected and tested as usual with all my Big Muff builds.

This thing is a beast; it produces a huge wall of fuzz, and the sustain control has a lot more usefull range than most Big Muff’s I have used.

It sounded so good I almost wanted to keep it for myself 😉



The Faces of Fuzz: A Brief History of the Fuzz Face.

I thought I would post a brief history of the good old Fuzz Face here.

My new pedal, the Gravyboat Fuzz, is based on the Colorsound One Knob Fuzz, with some tweaks and mods to make it fit more into a wider range of applications. The Gravy Boat, via the Colorsound One Knob Fuzz, can be traced back to the Arbiter Fuzz Face; the one that started it all!

Please also note that I have not covered any of the many modern variants of the Fuzz Face around, notable examples including the D*A*M Meathead, Meathead Deluxe and SuperBee, the Dunlop Fuzz Face re-issues (including the artist models), the Analogman Sunface etc. etc.

Also please note that these are my own personal thoughts on the tones these pedals produce. Tone is subjective, and you may have a very different impression of these circuits sounds and vibe!

A Brief History:

Arbiter Fuzz Face (Germanium).

The first Fuzz Face was the one that started it all; The Arbiter Fuzz Face.

The tones a Marshall head combined with a good germanium fuzz face produce can verge on divine!

It arrived in late 1966, in its iconic big, red and round enclosure. The original units used Germanium transistors, which produce a more ‘organic’ and warm distortion (IMO of course) compared to silicon, as a result of a softer clipping characteristic, and respond to rolling back guitar volume controls very well. Notice I say distortion and not fuzz. In my opinion, germanium Fuzz Faces can work just as well as an overdrive/distortion as a fuzz if the guitar volume control is carefully used.

A well tuned and biased Germanium fuzz can go all the way from clean, to crunch to all out Fuzz with a twist of your guitars volume control.

The original transitors used in these germanium Fuzz Faces were NKT 275’s, which are pretty much un-obtainium nowadays. If you find some be prepared to pay top £ for the pleasure. However, many other Germanium transistors can be used to good effect if carefull attention is paid to their gain (Hfe) and leakage characteristics.

The downside to the lovely warm fuzz that the old Germanium NKT275’s produced was the inconsistency; Germanium Transistors vary wildly in gain, leakage, and to top it off, are also temperature sensitive. Your old Germanium Fuzz Face will most likely sound very different depending on temperature!

Certain Fuzz Face aficionados will say that a Fuzz Face must have NKT275’s to be the real deal. I would not agree with this. In my opinion transistor selection (hfe, leakage etc.), biasing, and component selection is far more important to the overall quality of tone.

If you are in the UK/EU, and fancy building a germanium Fuzz Face, then Doctor Tweek (www.doctortweek.co.uk) usually has a nice range of Germanium transistors for sale at a very reasonable price.


Note: There is speculation that the Tonebender Mk1.5 came before the Fuzz Face, and that Arbiter used the circuit for the original round and red fuzzer; more info later!

Arbiter Fuzz Face (Silicon).

Due to problems with temperature stability, and consistency issues, Arbiter began making Fuzz Faces using Silicon transistors in the late 60’s.

Silicon Fuzz Faces exhibit a more aggressive fuzz tone; harder and more intense than the Germanium variants. Also, in general, they do not react as well to ‘cleaning up’ by rolling of guitar volume controls etc.

However, many people, myself included, prefer the more intense and general ‘fuzzy’ nature of silicon Fuzz Faces.

The silicon transistors used by Arbiter included BC108C, BC183L, BC109, BC109C, and BC209C. Most of these transistors are still readily available.

Many other silicon transistors sound great as well. Even the ubiquitous 2N3904 can sound great in a silicon Fuzz Face circuit.

Oh, and it is believed that the master of all guitar players; Jimi Hendrix, used a silicon Fuzz Face at his Woodstock performance!

The modern Dunlop Jimi Hendrix Fuzz Face (the blue one) also uses Silicon transistors (BC108’s).


If you fancy building your own fuzz face, our good friend Doctor Tweek also sells a nice range of silicon transistors (including BC108’s and 9’s).

Vox Tonebender.

The Vox ToneBender arrived at a similar time to the Arbiter Fuzz Face (production spanned from 1966-68), and was most likely based on the Tonebender MK1.5. Notice the addition of a couple of resistors to the standard Fuzz Face schematic.

These are also sometimes referred to as Italian Tonebenders, due to them being manufactured in… you guessed it… bella Italia!

The difference in tonality is clear when using this circuit. Component differences (particularly smaller input and output coupling capacitors) result in a far more treble laden and less ‘woolly’ fuzz than the original fuzz face. Perfect for playing through a dark amp (eg. VOX AC30), but perhaps overwhelmingly ‘ice-picky’ through bright amps (Fender Twins etc.). There is also in general less overall gain and sustain available with these units in comparison to the standard Fuzz Face.

Original transistors used in the Vox Tonebender were usually an SFT337 for Q1 and an OC76 for Q2. These will be hard to come by, but not as ridiculously priced as the ‘Holy Grail’ NKT275’s. It is also worth noting that silicon versions of this circuit were also produced.


Sola Sound Tonebender Mk 1.5.

The ToneBender Mk1.5 is a Fuzz Face variant of particular interest. This may be the original unit that spawned them all.

The reason for this is that it actually pre-dates the original Arbiter Fuzz Face (production began 1965). Therefore it is more than likely that Arbiter based the Fuzz Face on this circuit!

This fuzz utilised the classic glass cased Mullard OC75 germanium transistor for Q1 and Q2. A classic transistor in the Fuzz World, also used in the Tonebender MkII (another fabulous fuzz pedal). These transistors are quite rare and hard to find. If you find some, hold on to them!

They were built like a tank, and also, surprisingly for the time, featured true bypass switching and shielded in/out wiring.

The sound of these units is more similar to the classic Fuzz Face, in comparison to the Vox Tonebender with its treble heavy tone.

They sure do look cool though don’t they!

Note. A top notch, no expense spared, Mk1.5 re-issue  is available from the original retailer and manufacturer; Macaris Music. Be prepared to have to pay, and wait, for the pleasure of owning one though!


Colorsound Fuzz Box a.k.a the ‘One Knob Fuzz’

Now we come to my own personal favourite, and the basis for my own Gravy Boat Fuzz, the Colorsound ‘One Knob Fuzz’.

A silicon Fuzz Face variant employing BC109 and BC108 transistors, this fuzz produces a full, thick, intense fuzz tone; far more fuzz than your standard silicon Fuzz Face. They also happen to sound incredible when using a bass.

There was only one control on the One Knob Fuzz; volume. The relevant fuzz control resistor is set to 1K for all out fuzz attack. If you are after a ‘transparent’ Fuzz Face that cleans up well on the volume control then this is definitely not for you, but if you are after a massive fuzz tone… look no further.

A variety of interesting fuzzy tones can, however, be attained by adjusting your guitars volume and tone controls.

You may notice the extra capacitor between the base and collector of Q1 when looking at the schematic below. This capacitor is in the circuit to replicate the ‘Miller effect’; the high frequency roll-off that occurs with the Fuzz Face’s original germanium transistors. They also prevent oscillation and other nasty side effects that can occur when using silicon transistors in the fuzz face circuit.

Many modern silicon based Fuzz Face variants feature these capacitors to tame the high end and avoid oscillation.


SJ Effects Gravy Boat.

I can’t rightly finish a roundup of Fuzz Face variants without mentioning my own now can I!

My Gravy Boat Fuzz is based upon the Colorsound One Knob Fuzz, with tweaks to the design to get it to my exact liking. The pedal also features an internal bias control (bias is one of the most important factors in Fuzz tones) so it can be dialled in exactly at the sweet spot.

More info and ordering information here: https://sj-effects.com/2012/03/04/gravy-boat-fuzz/


The Fuzz Face is one of the most popular (if not the most popular) fuzz pedals around, and not without good reason.  Depending on circuit and component selection, it can conjure a range of tones ranging from spitty and splatty mis-biased velcro buzz, to smooth and warm touch sensitive overdrive.

There are many, many, Fuzz Face clones and variants available to purchase, ranging from tens of pounds all the way into the thousands.

However, if you are a DIY’er, or fancy getting your feet wet, the Fuzz Face is a perfect pedal to build up and experiment with.

I recommend getting the breadboard out, grabbing a beer, and building up the different variants, experimenting with bias, in and out coupling capacitors etc. to come up with your own perfect Fuzz Face.

The standard Fuzz Face hfe values are usually recommended at 80-90Hfe for Q1, and 110-130Hfe for Q2. However, experimentation is key. For example, the recent Joe Bonamassa Fuzz Face features Germanium transistors with a much lower hfe, but still produces a lovely smooth fuzz tone.

An excellent source for more technical information (bias, hfe ranges) on the Fuzz Face can be found here: http://www.geofex.com/article_folders/fuzzface/fffram.htm

The beauty of the circuit is its versatility for such a simple design, and perhaps this is the reason for its enduring popularity after over 40 years on the market.

That completes my small roundup of Fuzz Face variants. I hope you found the information helpfull, and if you get a chance to try any of these classics, you will not be dissapointed with the fuzzy goodness they provide!

Boostie Boy

This is a recent custom build I did for a nice guy who wanted a nice clean boost to use with his valve amps.

He christened the build the ‘Boostie Boy’, which I quite like!

The circuit is based on the classic Jack Orman Mosfet Booster.

As you can see from the ‘gutshot’ photo below, its a simple circuit (a single Mosfet Transistor amplication stage), but this simplicity results in a really nice and full tone. Boosters are one of the simplest, but also most useful, pedals out there IMO.

Another handy feature is that with the Gain control at minimum, it works quite well as a buffer, which can be handy for long signal paths (ie. long cable runs) where high frequencies can become attenuated.

If you would like to discuss a custom order similar to this build, just Contact Me.

The Boostie Boy Lives!

Boostie Boy Gutshot





The Gravy Train Overdrive

Here’s the Gravy Train overdrive. Which I posted a soundclip for last week.

This is one of my Standard line of pedals (ie. non custom), and can be ordered from the ‘pedals for sale‘ section on the site.

Here’s the soundclip:

Its an Overdrive based on the classic DOD OD-250. With selectable Asymmetrical/Symmetrical clipping stages. This defines the overall tonality of the overdrive/distortion.

The symmetrical clipping  uses some old OA202’s (no longer manufactured) which I have a small stock of. After going through all my collection of clipping options (germanium, silicon, LED’s etc.) these sounded the best to my ears, so in they went.

I’m loving this circuit; Its so simple, but it sounds really great.

Hope you guys like the pics and soundclip!

Gravy Train Overdrive 2

Gravy Train Gutshot

Cerberus Fuzz and Dirt Triumvirate (+Demo Videos)

A couple of Fuzz pedals I have been working on.

Its safe to say I love me some Fuzz!

First of all, I did a couple of demo videos for both of these circuits which can be seen here:

Hope you enjoy the vids!

Cerberus Fuzz.

The Cerberus is a ‘3-in-1’ pedal with Octave, Fuzz, and Tone circuits. All three circuits can be switched in and out of the signal path for a variety of tones.

I find this a cool circuit to play around with, and it covers a wide range of fuzzy requirements.

The Fuzz circuit is based on the Coloursound One Knob Fuzz. Basically a Fuzz Face with bigger, hairier, balls… 😉

The Octave circuit is the classic Green Ringer circuit. It can verge between clean octave tones (especially when playing with a neck pickup above the 12th fret) to glitched out, ‘my guitar is having an aneurysm’ mayhem when playing chords etc.

The Tone circuit is the classic Big Muff Pie tonestack, with a standard recovery gain stage. There is also an internal trimpot to set the level of mids (from scooped to boosted).

Cerberus Fuzz

Cerberus Fuzz.
Three headed fuzz monster!

Cerberus Fuzz Gutshot

Cerberus Fuzz Gutshot

Dirt Triumvirate.

The Dirt Triumvirate is a ‘3-in-1’ pedal with 1 Boost and 2 Fuzz circuits. All three circuits can be switched in and out of the signal path for a variety of tones.

The boost circuit is based upon the classic LPB1 circuit, with an internal DIP switch to switch between treble, mid and full range boost.

The Fuzz1 circuit is the classic Bazz Fuss. This is a really cool sounding circuit and can provide a variety of cool tones.

The Fuzz2 circuit is based on the Coloursound One Knob Fuzz. Its fair to say I am a big fan of this circuit!

Depending on control settings the Dirt Triumvirate can go from a nice crunchy overdrive to all out Fuzz chaos (noise, feedback, oscillations, etc.).

Dirt Triumvirate

Dirt Triumvirate

Dirt Triumvirate Gutshot

Dirt Triumvirate Gutshot

The Cerberus Fuzz is one of my ‘standard’ pedals (ie. not custom). If you want one building please get in touch; its a really cool circuit with lots of (Fuzzy) uses.

I will also be offering PCB’s for the DIY’ers out there. If you would like more info just get in touch.


Been busy times at SJ Effects the past few weeks.

One of the things I have been working on is my Tonmeister design.

The Tonmeister is a 3 band equaliser based around the 3-band Baxandall active equaliser design. The circuit also comprises of an input buffer, and output gain stage, to increase versatility.

The circuit can be used for many applications, including:

  • As a versatile tone control/equaliser for amps with no tone controls (Fender Champ etc.)
  • ‘Tone sculpting’ after/before other effects (the Tonmeister is great fun to tweak running after an Overdrive/Distortion/Fuzz pedal).
  • A buffer.
  • A Treble/Mids/Bass/Full range booster.
  • It also works great on Bass guitar!

I’m really loving this circuit at the moment; its incredibly versatile, kind of an ‘always on’ pedal. I’ve found it really cool running after Fuzz pedals to ‘shape’ the overall tone of fuzzes.

There is an internal voltage inverter circuit that enables the circuit to run at +9/-9V. This allows for more headroom to be available than with standard ‘9V only’ boosts and eq’s.

I’m considering the Tonmeister becoming a ‘standard’ SJ Effects pedal (along with the Tesla Cannon and a few other things) in the near future.

If you would like me to build you one just get in touch!


Tonmeister EQ and Preamp

Tonmeister Gutshot

Tonmeister Gutshot

Prince Albert

Here’s a few quick pic’s of my Catalinbread RAH clone that I built for myself.

I called it ‘Prince Albert’ 😉

I used PCB mounted pots (which I use for most builds now), which made the wiring a lot less of a headache!

As with all Catalinbread circuits, this thing rules. There is a lot to learn from their designs IMO.

Its another cool JFet overdrive (my favourite type) that responds really well to picking dynamics, and loves Humbuckers.

Check out their stuff at http://www.catalinbread.com.

Prince Albert Overdrive

Prince Albert Gutshot