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DRIVETONELEVELTONE SHIFT

125B · 4 knobs

Aion FX

WyvernSilicon Drive

Based on the Dinosaural Tube Bender· 2 other boards clone it

Category
Fuzz· Overdrive / Fuzz
Controls
Drive · Tone · Level · Tone Shift
Difficulty
Easy
Price
$12.50in stock

From the vendor

A reproduction of a rare silicon-transistor drive pedal designed by Dan Coggins, formerly of Lovetone, handbuilt in small quantities from 2003–2007.

The Wyvern Silicon Drive is an adaptation of the Tube Bender, a silicon transistor overdrive designed by Dan Coggins of Dinosaural (and formerly of Lovetone). It was originally designed as a DIY project and kit by Guitar Magazine (UK) in February 2003.

In October of the same year, Dan tweaked the voicing of the circuit and added the “Tone Shift” switch and began building it commercially under the Dinosaural name. Around 140 of them were made before production ceased in 2007. In 2016, Dan built another 12 units using the original circuit board, parts and internal wiring, with the only difference being the black enclosure compared to the original white.

Despite the low number of units in existence, the Tube Bender found its way into the hands of several musicians and producers in the UK, including Snow Patrol who have several of them. (According to their manager, their “Eyes Open” album from 2006 had Tube Benders all over it.)

As the name implies, it was designed to land somewhere in between the Tube Screamer and Tone Bender in sound, although the circuit shares nothing in common with either of them from an engineering perspective. And while the schematic does resemble other silicon fuzz circuits such as the Hot Silicon, it’s definitely not voiced like a fuzz.

The Wyvern is based on the commercial version of the Tube Bender which was traced by Aion FX in 2020. The earlier magazine version can also be built with a few parts substitutions that are provided. The only modification in the Wyvern is the use of a 3-position switch for the Tone Shift so you can have a third setting in between the other two.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 42 rows

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RefValueNormalizedTypeNotes
Resistors 17
R11k51.5kMetal film resistor, 1/4W1k2 in magazine project.
R21M1MMetal film resistor, 1/4W
R3120k120kMetal film resistor, 1/4W100k in magazine project.
R41k21.2kMetal film resistor, 1/4W
R52k22.2kMetal film resistor, 1/4W
R6150R150Metal film resistor, 1/4W
R71k21.2kMetal film resistor, 1/4W
R810k10kMetal film resistor, 1/4W22k in magazine project.
R91k21.2kMetal film resistor, 1/4W2k2 in magazine project.
R1010k10kMetal film resistor, 1/4W22k in magazine project.
R1110k10kMetal film resistor, 1/4W22k in magazine project.
R1222k22kMetal film resistor, 1/4W68k in magazine project.
R1322k22kMetal film resistor, 1/4W
R1422k22kMetal film resistor, 1/4W
R15100R100Metal film resistor, 1/4WPower supply resistor.
RPD2M22.2MMetal film resistor, 1/4WInput pulldown resistor. Can be as low as 1M.
LEDR4k74.7kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 10
C110n10nFilm capacitor, 7.2 x 2.5mm
C247n47nFilm capacitor, 7.2 x 2.5mm100n in magazine project.
C347n47nFilm capacitor, 7.2 x 2.5mm100n in magazine project.
C43n33.3nFilm capacitor, 7.2 x 2.5mm4n7 in magazine project.
C510n10nFilm capacitor, 7.2 x 2.5mm
C633n33nFilm capacitor, 7.2 x 2.5mm
C710n10nFilm capacitor, 7.2 x 2.5mmModification that adds a 3rd Tone Shift position from the original. Can experiment with 15n or 22n here as well.
C847uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C9100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C10100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 1
D11N58171N5817Schottky diode, DO-41
Transistors 4
Q12N50882N5088BJT transistor, NPN, TO-92Original uses BC549C. 2N5088 is the USA standard equivalent.
Q22N39062N3906BJT transistor, PNP, TO-92Original uses BC307B (obsolete). 2N3906 is equivalent.
Q32N50882N5088BJT transistor, NPN, TO-92Original uses BC549C. 2N5088 is the USA standard equivalent.
Q42N50882N5088BJT transistor, NPN, TO-92Original uses BC549C. 2N5088 is the USA standard equivalent.
Potentiometers 3
DRIVE100kAA100k16mm right-angle PCB mount pot50kA in magazine project.
TONE100kBB100k16mm right-angle PCB mount pot50kA in magazine project.
LEVEL100kBB100k16mm right-angle PCB mount pot50kA in magazine project.
Switches 1
FSW3PDT3PDTStomp switch, 3PDT
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 3
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountMouser 163-4302-E or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Dinosaural Tube Bender