Enclosure not stated · 2 knobs
Hornby Skewes Zonk Machine II
Based on the Hornby Skewes Zonk Machine II· 2 other boards clone it
From the post
Best info I could find on this creamy classic fuzz goodie.
The 1967 John Hornby Skewes Zonk Machine II is an extremely rare, and vintage pedal enthusiasts have long coveted both the original Zonk and its successor, the Zonk II. The Zonk II was the result of a re-engineered Zonk Machine I, which was based upon the Sola Sound MK I Tone Bender circuit. Featuring (2) PNP M2N 4403 Silicon transistors, instead of the earlier (3) Germanium transistor based Zonk Machine I, the Zonk Machine II is more stable, smoother, and less dark sounding. Effectively designed to be a complete and practical unit, the Zonk II’s predecessor was intended to be used in conjunction with the JHS Treble Booster unit (essentially like a Rangemaster) as to enhance the articulation and clarity of the otherwise muddy Zonk. Interestingly, John Hornby Skewes did offer both units within one box, and it was re-branded as the famous Shatterbox.
The rolled steel casing with a blue Hammerite finish is very reminiscent in design to the gold MK I Tone Bender: with two basic controls on top, and the input and output next to one another on the back, the straight-forward aesthetic is a reflection of the absolute perfect simplicity of the circuit within. It is loud, robust, full-range, and complementary with most any rig. It is sweet, subtle, and sings with sustain. Completely inspirational to play through, the Zonk II offers endless enjoyment, and tone otherwise unavailable via a reissue, clone, or kit.
Layout 1: Original PNP
Layout 2: Original NPN
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 13 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 47k | 47k | read from the layout by eye | |
| ×1 | 680k | 680k | read from the layout by eye | |
| ×1 | 10k | 10k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 3.9k | 3.9k | legend: may not be needed; read from the layout by eye | |
| Capacitors 4 | ||||
| C1 | ? | ? | electrolytic, value not given; legend: C1 ranged from 80uF to 125uF; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 25uF | 25u | electrolytic; read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N4061 | 2N4061 | PNP Si; read from the layout by eye | |
| Q2 | 2N4061 | 2N4061 | PNP Si; read from the layout by eye | |
| Potentiometers 2 | ||||
| Fuzz | B5K | B5k | Potentiometer | read from the layout by eye |
| Swell | A500K | A500k | Potentiometer | read from the layout by eye |
Other boards based on the Hornby Skewes Zonk Machine II
- Zonk II (Germanium) Amplified Parts
- Hornby Skewes Zonk Machine II Effects Layouts (blog) · 1590A