125B · 4 knobs
AscalonOctave Fuzz
Based on the King Tone Octaland· 1 other board clones it
- Category
- Fuzz· Octave fuzz
- Controls
- Drive · Voice · Blend · Volume
- Difficulty
- Easy
- Price
- $12.50in stock
From the vendor
A vintage-flavored octave fuzz based on the Roger Mayer Octavia with an added clean blend and dual-stage tone control.
The Ascalon Octave Fuzz is based on the King Tone Octaland Mini, first released in 2019 as an updated version of the original Octaland. It was traced by Aion FX in 2024.
At its core, the octave section is adapted from the Roger Mayer Octavia, which also served as the inspiration for the Catalinbread Octapussy. But it expands a lot on the classic circuit with the addition of a clean blend (useful for retaining low end) and an innovative two-stage tone control, along with an input capacitor selection and more circuit tweaks by way of internal DIP switches.
King Tone released an updated version of the Octaland Mini in 2022, moving the DIP switches to the outside and adding some extra options. Our trace was from a 2020 unit, so we do not know what changes were made in this version.
The Ascalon is a direct adaptation of the Octaland Mini with no modifications or changes other than some minor tweaks to the power supply to standardize it with our other projects.
Note: This project uses a type of capacitor that has been temporarily discontinued by WIMA. Please see our news article about the issue and the substitution spreadsheet for project-specific recommendations. We are stocking a limited supply in the mean time. The build document has not yet been updated to reflect this.
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 70 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 30 | ||||
| R1 | 2M | 2M | Metal film resistor, 1/4W | |
| R2 | 750k | 750k | Metal film resistor, 1/4W | |
| R3 | 1k | 1k | Metal film resistor, 1/4W | |
| R4 | 1k | 1k | Metal film resistor, 1/4W | |
| R5 | 10k | 10k | Metal film resistor, 1/4W | |
| R6 | 10k | 10k | Metal film resistor, 1/4W | |
| R7 | 1M | 1M | Metal film resistor, 1/4W | |
| R8 | 487k | 487k | Metal film resistor, 1/4W | |
| R9 | 100k | 100k | Metal film resistor, 1/4W | |
| R10 | 10k | 10k | Metal film resistor, 1/4W | |
| R11 | 3M | 3M | Metal film resistor, 1/4W | |
| R12 | 360k | 360k | Metal film resistor, 1/4W | |
| R13 | 20k | 20k | Metal film resistor, 1/4W | |
| R14 | 510R | 510 | Metal film resistor, 1/4W | |
| R15 | 51k | 51k | Metal film resistor, 1/4W | |
| R16 | 100k | 100k | Metal film resistor, 1/4W | |
| R17 | 220k | 220k | Metal film resistor, 1/4W | |
| R18 | 3M | 3M | Metal film resistor, 1/4W | |
| R19 | 360k | 360k | Metal film resistor, 1/4W | |
| R20 | 20k | 20k | Metal film resistor, 1/4W | |
| R21 | 510R | 510 | Metal film resistor, 1/4W | |
| R22 | 10k | 10k | Metal film resistor, 1/4W | |
| R23 | 100k | 100k | Metal film resistor, 1/4W | |
| R24 | 1M | 1M | Metal film resistor, 1/4W | |
| R25 | 1M | 1M | Metal film resistor, 1/4W | |
| R26 | 10k | 10k | Metal film resistor, 1/4W | |
| R27 | 15k | 15k | Metal film resistor, 1/4W | |
| R28 | 100R | 100 | Metal film resistor, 1/4W P | ower supply filter resistor. |
| RPD | 2M2 | 2.2M | Metal film resistor, 1/4W I | nput pull-down resistor. |
| LEDR | 10k | 10k | Metal film resistor, 1/4W L | ED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 19 | ||||
| C1 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 5n1 | 5.1n | MLCC capacitor, NP0/C0G | See build notes for capacitor selection. |
| C3 | 5n6 | 5.6n | Film capacitor, 7.2 x 2.5mm | |
| C4 | 22uF | 22u | Electrolytic capacitor, 5mm | |
| C5 | 2n2 | 2.2n | Film capacitor, 7.2 x 2.5mm | |
| C6 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C7 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C8 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C9 | 15n | 15n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 4.7uF | 4.7u | Electrolytic capacitor, 4mm | |
| C11 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C12 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C14 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C15 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C16 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C17 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C18 | 100uF | 100u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C19 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| D2 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| D3 | 1N914 | 1N914 | Fast-switching diode, DO-35 | |
| Transistors 5 | ||||
| Q1 | 2N5089 | 2N5089 | BJT transistor, NPN, TO-92 | Can substitute BC549C (rotate 180 degrees) |
| Q2 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Q3 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Q4 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Q5 | 2N3904 | 2N3904 | BJT transistor, NPN, TO-92 | |
| Potentiometers 4 | ||||
| BLEND | 50kB | B50k | 16mm right-angle PCB mount pot | |
| DRIVE | 1kC | C1k | 16mm right-angle PCB mount pot | |
| VOICE | 50kB | B50k | 16mm right-angle PCB mount pot | 50kW in original. See build notes. |
| VOLUME | 100kB | B100k | 16mm right-angle PCB mount pot | |
| Trimmers 1 | ||||
| BIAS | 10k | 10k | Trimmer, 10%, 1/4" | Bourns 3362P or similar. |
| Switches 3 | ||||
| INPUT | SPDT center off | SPDT CENTER OFF | Toggle switch, SPDT on-off-on | |
| SW1 | DIP switch, 2-pos. | DIP SWITCH, 2-POS. | DIP switch, 2-position | |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | Available from Aion FX. |
| Jacks & sockets 3 | ||||
| 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 | Lumberg NEB/J 21 C 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. |
Other boards based on the King Tone Octaland
- OctaKing Octave Fuzz PedalPCB · 125B · $12.00