125B · 3 knobs
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
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 21 | ||||
| R1 | 1k | 1k | Metal film resistor, 1/4W | |
| R2 | 510k | 510k | Metal film resistor, 1/4W | |
| R3 | 10k | 10k | Metal film resistor, 1/4W | |
| R4 | 100k | 100k | Metal film resistor, 1/4W | |
| R5 | 33k | 33k | Metal film resistor, 1/4W | |
| R6 | 470R | 470 | Metal film resistor, 1/4W | |
| R7 | 2k2 | 2.2k | Metal film resistor, 1/4W | |
| R8 | 2k2 | 2.2k | Metal film resistor, 1/4W | |
| R9 | 6k8 | 6.8k | Metal film resistor, 1/4W | |
| R10 | 6k8 | 6.8k | Metal film resistor, 1/4W | |
| R11 | 1k | 1k | Metal film resistor, 1/4W | |
| R12 | 10k | 10k | Metal film resistor, 1/4W | |
| R13 | 1M | 1M | Metal film resistor, 1/4W | |
| R14 | 10k | 10k | Metal film resistor, 1/4W | |
| R15 | 470R | 470 | Metal film resistor, 1/4W | |
| R16 | 100k | 100k | Metal film resistor, 1/4W | |
| R17 | 22k | 22k | Metal film resistor, 1/4W | |
| R18 | 22k | 22k | Metal film resistor, 1/4W | |
| R19 | 100R | 100 | Metal film resistor, 1/4W | |
| RPD | 2M2 | 2.2M | Metal film resistor, 1/4W | Input pulldown resistor. |
| LEDR | 10k | 10k | Metal film resistor, 1/4W | LED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 16 | ||||
| C1 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C3 | 220pF | 220p | MLCC capacitor, NP0/C0G | Some units also used 1n. Reissue SD-9M uses 1n2. See build notes. |
| C4 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C6 | 470n | 470n | Film capacitor, 7.2 x 3mm | |
| C7 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C8 | 27n | 27n | Film capacitor, 7.2 x 2.5mm | |
| C9 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C11 | 68n | 68n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | Can also use 5mm. |
| C14 | 47uF | 47u | Electrolytic capacitor, 5mm | Reference voltage filter capacitor. |
| C15 | 47uF | 47u | Electrolytic capacitor, 5mm | Reference voltage filter capacitor. |
| C16 | 100uF | 100u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C17 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| Diodes 7 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| D2 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D3 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D4 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D5 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D6 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D7 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| Transistors 2 | ||||
| Q1 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses 2SC1815-BL. |
| Q2 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses 2SC1815-BL. |
| ICs 1 | ||||
| IC1 | JRC4558D | JRC4558D | Operational amplifier, DIP8 | |
| Potentiometers 3 | ||||
| DRIVE | 250kA | A250k | 16mm right-angle PCB mount pot | Original uses linear taper, but audio taper works better here. |
| TONE | 25kB | B25k | 16mm right-angle PCB mount pot | The original uses 20kB if you can find it, but 25kB is much more common and will work the same. |
| VOL. | 100kA | A100k | 16mm right-angle PCB mount pot | Original uses linear taper, but audio taper works better here. |
| Switches 3 | ||||
| CLIP | SPDT cntr off | SPDT CNTR OFF | Toggle switch, SPDT center off | |
| MIDS | SPDT cntr off | SPDT CNTR OFF | Toggle switch, SPDT center off | |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| LEDs 3 | ||||
| D8 | 3mm LED | 3MM LED | LED, 3mm, red diffused | |
| D9 | 3mm LED | 3MM LED | LED, 3mm, red diffused | |
| LED | 5mm | 5MM | LED, 5mm, red diffused | |
| Jacks & sockets 4 | ||||
| IC1-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IN | 1/4" stereo | 1/4" STEREO | 1/4" phone jack, closed frame | Switchcraft 112BX or equivalent. |
| OUT | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| DC | 2.1mm | 2.1MM | DC jack, 2.1mm panel mount | Mouser 163-4302-E or equivalent. |
| Hardware 2 | ||||
| BATT | Battery snap | BATTERY SNAP | 9V battery snap | Optional. Use the soft plastic type—the hard-shell type will not fit. |
| ENC | 125B | 125B | Enclosure, die-cast aluminum | Can also use a Hammond 1590N1. |