Akashic Guitar effects circuit lookup
GAINTONEVOLUME

Enclosure not stated · 3 knobs

Tagboard Effects

ROG Supreaux DeuxVerified

Based on the Run Off Groove Supreaux Deux· 6 other boards clone it

Controls
Gain · Tone · Volume
Build
Vero· 20×11· 14 cuts, 5 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Amp Emulation, Charge pump, Distortion, Overdrive, Runoffgroove

From the post

Runoffgroove's stompbox emulation of the old Supro 16T amps and so potentially a good one for the BJF Honey Bee fans. This one needs 18V and so will require an appropriate power supply, or maybe make yourself a voltage converter like this one. Info from the website:

Supro was a budget brand name for amplifiers produced by Valco in Chicago, IL during the golden age of tubes. The same model of amplifier could be sold as a Gretsch, National, or Airline brand (through the Montgomery-Ward catalog). Valco manufactured amps are now highly sought after and have increased in price accordingly. Jimmy Page reportedly used a Supro amp while recording Led Zeppelin's debut album and other guitarists have also employed the small combos in the studio for searing electric blues. In April of 2002, these amps were featured in the ToneQuest Report.

The original Supro 16T circuit design is similar to other single-ended Class A amplifiers from the period, but subtle differences are present. The filter network following the first stage rolls off bass and treble content where the tonestack of a Fender Champ or Princeton normally resides. The Supro's single Tone control is placed after the second pre-amp stage. Thus, more high-end signal is present to drive the second stage. Also, there is no use of negative feedback to reduce distortion. This circuit produces a wide range of sounds that do not sound much like the Fenders, Voxes, and other famous names; it has it's own character and identity.

More information about the circuit can be found on the Runoffgroove website.

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 24 rows

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RefValueNormalizedTypeNotes
Resistors 7
×31M1Mread from the layout by eye
×2100K100kread from the layout by eye
×21K1kread from the layout by eye
×2390R390read from the layout by eye
×156K56kread from the layout by eye
×122K22kread from the layout by eye
×1100R100read from the layout by eye
Capacitors 8
×1270p270pread from the layout by eye
×2470p470pread from the layout by eye
×21n51.5nread from the layout by eye
×12n22.2nread from the layout by eye
×14n74.7nread from the layout by eye
×168n68nread from the layout by eye
Cx2n22.2n2n2 to 10n to taste for Fat switch; read from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
Transistors 3
Q12N54572N5457JFET; read from the layout by eye
Q2J201J201JFET; read from the layout by eye
Q32N54572N5457JFET; read 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
×210K10kat Q1 and Q3; read from the layout by eye
×150K50kat Q2; read from the layout by eye
Switches 1
Sw1SPSTSPSTFat switch; legend: 2 position SPST, wired as Sw1a / Sw1b; read from the layout by eye

Other boards based on the Run Off Groove Supreaux Deux