Akashic Guitar effects circuit lookup
GAINTONEVOLUME

Enclosure not stated · 3 knobs

Tagboard Effects

JHS SuperboltVerified

Based on the JHS Superbolt· 5 other boards clone it

Controls
Gain · Tone · Volume
Build
Vero· 20×1· 26 cuts, 11 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Amp Emulation, Overdrive

From the post

JHS's ROG Supreaux Deux!

From the inception of the Supro Company in 1935 until its closing in 1968, no other brand of amplifier has had such a fascinating, mysterious and legendary story. The Supro amps deliver the voice of rock and roll, from Jimmy Page’s legendary Led Zeppelin recordings or Brian Setzer’s early Stray Cat tracks, to the raging rhythm tones of Switchfoot’s Drew Shirley. If you have ever played one of these vintage amps then you know nothing sounds the same. No matter how high you take the volume, the amp delivers the same smooth but cutting tone that has shaped countless recordings over its 75+year history.

The JHS SuperBolt overdrive pedal, at its heart, is a discreet circuit, designed to emulate the tone and character of the 1960’s-era Supro amps. From its touch-sensitivity to the way the pedal sags with tube rectifier color at higher gain settings, the SuperBolt will give any guitar rig a versatile and useful new set of tones, reminiscent of some of the greatest sounds ever recorded. With 3 simple knob controls named Volume, Tone, and Drive, you will have the ability to make any guitar rig drip with vintage soul and attitude that no pedal has ever delivered- until now.

To understand how the SuperBolt operates, let’s begin with the Drive knob. As you turn up the Drive, it’s like turning the volume knob on one of these small-box vintage amps; the more you turn it up, the dirtier it gets. Next, the Volume knob acts like what some would call a master volume. None of the vintage Supro amps had this control, but it works perfectly for letting the SuperBolt get the dirty cranked-volume tones with the Drive knob and then backing down the loudness factor with the Volume knob. The third knob is the Tone control, fairly true to the designs in many of these vintage amps. Our Tone control will serve as a breath of fresh air to all of you who are tired of the unusable and treble-ridden tone controls out there. All the way up, it is a biting and sharp tone that is extremely usable and easy on the ears; all the way back, you will find a dark but well-focused range of tones, useful for jazz and more subtle styles.

The Hi/Low toggle switch lets you toggle between Hi and Low gain settings, much like the High/Low input jacks found on many of the amps of the 50’s and 60’s. In the down (Hi) position, you’ll find huge amounts of headroom, more upper mids, more available dirt, and the most rock and roll that the pedal can offer. In the up (Low) position, cleaner sounds are available and a slightly darker and more mellow tone. The SuperBolt runs on a basic 9v supply, but internally it converts that 9v to 18v, for massive punch, headroom, and its overall powerful character. Do not attempt to power the SuperBolt with a 18v power supply.

You will notice that the overall tone is open and full, without the compression found in many overdrives on the market. It will compliment a more compressed drive beautifully, and it stacks well with everything we h

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 25 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • 120K resistor (centre right, below the 100K trimmer): printed clearly, unusual value
RefValueNormalizedTypeNotes
Resistors 7
×21M1Mread from the layout by eye
×2470K470kread from the layout by eye
×212K12kread from the layout by eye
×1120K120kread from the layout by eye
×12K72.7kread from the layout by eye
×11K51.5kread from the layout by eye
×1220R220read from the layout by eye
Capacitors 8
×34n74.7nread from the layout by eye
×210n10nread from the layout by eye
×23n33.3nread from the layout by eye
×122n22nread from the layout by eye
×2470p470pread from the layout by eye
×210u10uelectrolytic; read from the layout by eye
×133u33uelectrolytic; read from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
Diodes 1
×21N58171N5817read from the layout by eye
Transistors 2
×2J201J201JFET; read from the layout by eye
×12N54572N5457JFET; read from the layout by eye
ICs 1
×1LT1054LT1054read from the layout by eye
Potentiometers 3
GainA500KA500kPotentiometerread from the layout by eye
ToneA500KA500kPotentiometerread from the layout by eye
VolumeA100KA100kPotentiometerread from the layout by eye
Trimmers 2
×250K50kread from the layout by eye
×1100K100kread from the layout by eye
Switches 1
Hi/LoSPDT on/onSPDT ON/ONtoggle; read from the layout by eye

Other boards based on the JHS Superbolt