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DRIVETONEVOLUME

125B · 3 knobs

Aion FX

MeteorVintage Distortion

Based on the Ibanez SD-9 Sonic Distortion

Category
Distortion
Controls
Drive · Tone · Volume
Difficulty
Easy
Price
$12.50in stock

From the vendor

A hard-edged distortion pedal from the early 1980s, notably used by Scott Henderson and John Shanks.

The Meteor Vintage Distortion project is a clone of the Maxon/Ibanez SD-9 Sonic Distortion, which first hit stores around 1983. Advertised as a heavier Tube Screamer, in reality it shares nothing at all in common with the classic TS-9 circuit. It has more similarities to hard-clipping circuits such as the BOSS DS-1 or MXR Distortion+.

In 2012, Ibanez released an updated reissue of the SD-9 called the SD-9M, which was one of the first traces we ever did back in 2014. It includes two modifications: a switchable +10x gain stage and a midrange toggle switch that changes the EQ of the tone control.

The Meteor is based on the original SD-9, but with the midrange mod from the SD-9M. Since the SD-9M’s gain stage mod is not original to the circuit and is always partially in the audio path even when it’s switched off, we have not included this modification in the Meteor project, opting to keep it 100% the same as the vintage unit. However, since the midrange switch has one position identical to the original circuit, we included this switch along with a third position not found in the SD-9M for even more tonal flexibility. There is also a toggle switch to select between three different sets of clipping diodes, two of which will significantly increase the available output volume.

The updated version of the Meteor is the same as the original legacy project, with no new or changed features aside from being redesigned for the 125B enclosure.

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 62 rows

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RefValueNormalizedTypeNotes
Resistors 21
R11k1kMetal film resistor, 1/4W
R2510k510kMetal film resistor, 1/4W
R310k10kMetal film resistor, 1/4W
R4100k100kMetal film resistor, 1/4W
R533k33kMetal film resistor, 1/4W
R6470R470Metal film resistor, 1/4W
R72k22.2kMetal film resistor, 1/4W
R82k22.2kMetal film resistor, 1/4W
R96k86.8kMetal film resistor, 1/4W
R106k86.8kMetal film resistor, 1/4W
R111k1kMetal film resistor, 1/4W
R1210k10kMetal film resistor, 1/4W
R131M1MMetal film resistor, 1/4W
R1410k10kMetal film resistor, 1/4W
R15470R470Metal film resistor, 1/4W
R16100k100kMetal film resistor, 1/4W
R1722k22kMetal film resistor, 1/4W
R1822k22kMetal film resistor, 1/4W
R19100R100Metal film resistor, 1/4W
RPD2M22.2MMetal film resistor, 1/4WInput pulldown resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 16
C147n47nFilm capacitor, 7.2 x 2.5mm
C247n47nFilm capacitor, 7.2 x 2.5mm
C3220pF220pMLCC capacitor, NP0/C0GSome units also used 1n. Reissue SD-9M uses 1n2. See build notes.
C4220n220nFilm capacitor, 7.2 x 2.5mm
C6470n470nFilm capacitor, 7.2 x 3mm
C710n10nFilm capacitor, 7.2 x 2.5mm
C827n27nFilm capacitor, 7.2 x 2.5mm
C933n33nFilm capacitor, 7.2 x 2.5mm
C1033n33nFilm capacitor, 7.2 x 2.5mm
C1168n68nFilm capacitor, 7.2 x 2.5mm
C12100n100nFilm capacitor, 7.2 x 2.5mm
C131uF1uFilm capacitor, 7.2 x 3.5mmCan also use 5mm.
C1447uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C1547uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C16100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C17100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 7
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
D41N9141N914Fast-switching diode, DO-35
D51N9141N914Fast-switching diode, DO-35
D61N9141N914Fast-switching diode, DO-35
D71N9141N914Fast-switching diode, DO-35
Transistors 2
Q12N50882N5088BJT transistor, NPN, TO-92Substitute. Original uses 2SC1815-BL.
Q22N50882N5088BJT transistor, NPN, TO-92Substitute. Original uses 2SC1815-BL.
ICs 1
IC1JRC4558DJRC4558DOperational amplifier, DIP8
Potentiometers 3
DRIVE250kAA250k16mm right-angle PCB mount potOriginal uses linear taper, but audio taper works better here.
TONE25kBB25k16mm right-angle PCB mount potThe original uses 20kB if you can find it, but 25kB is much more common and will work the same.
VOL.100kAA100k16mm right-angle PCB mount potOriginal uses linear taper, but audio taper works better here.
Switches 3
CLIPSPDT cntr offSPDT CNTR OFFToggle switch, SPDT center off
MIDSSPDT cntr offSPDT CNTR OFFToggle switch, SPDT center off
FSW3PDT3PDTStomp switch, 3PDT
LEDs 3
D83mm LED3MM LEDLED, 3mm, red diffused
D93mm LED3MM LEDLED, 3mm, red diffused
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 4
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
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.