Enclosure not stated · 3 knobs
VOX MKIV TonebenderVerified
Based on the Vox MKIV Tonebender
From the post
Description of the MKIV origin from the captain.
The origins. Tone Bender MKIII, Tone Bender MKIV. Same party different frock. Aside from the obvious differences in the enclosure type of these pedals any true solid definition of which is what in regards to circuit type is and will always be a little bit of an ambiguous subject. The way I always made sense of it in my head was in regards to the biasing. The early MKIII's were choppy, heavy, clumsy, a fuzzy lump hammer. The later MKIV's were smooth, dynamic, articulate, a distorted boxing glove. In between, you have a foggy transitional period. Even with the those definitions in place it never always runs true.
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 19 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 25uF and 6.4uF electrolytics: printed clearly, unusual values
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×1 | 3.3k | 3.3k | read from the layout by eye | |
| ×5 | 10k | 10k | read from the layout by eye | |
| ×1 | 18k | 18k | read from the layout by eye | |
| ×1 | 100k | 100k | read from the layout by eye | |
| ×1 | 220k | 220k | read from the layout by eye | |
| ×1 | 680k | 680k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 2nF | 2n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 6.4uF | 6.4u | electrolytic; read from the layout by eye | |
| ×1 | 25uF | 25u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N270 | 1N270 | Ge diode; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | PNP Ge | PNP GE | Q1-Q3: PNP Ge, no type given; read from the layout by eye | |
| Q2 | PNP Ge | PNP GE | Q1-Q3: PNP Ge, no type given; read from the layout by eye | |
| Q3 | PNP Ge | PNP GE | Q1-Q3: PNP Ge, no type given; read from the layout by eye | |
| Potentiometers 3 | ||||
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Sustain | B100K | B100k | Potentiometer | read from the layout by eye |