Enclosure not stated · 3 knobs
Electro Harmonix V2 Big Muff Ram's Head "White Can version" 1974Verified
Based on the Electro-Harmonix Big Muff Pi· 73 other boards clone it
- Category
- Distortion
- Build
- Vero· 19×17· 17 cuts, 5 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Big Muff, Distortion, Electro Harmonix, Fuzz, MOJO
From the post
It is Pie Day so here is a layout of an old Ram's Head variant. Rarely cloned and some cap values is not found in any of the other vintage EHX variants. 220pF/680pF caps replaces the standard 470pF/500pF values and the tonestack has less mid scoop. Still added a Mid switch for some sligtly boosted mids. Note that the FS36999 was house numbered 2N5133s. These varied in Hfe a lot, ranging between 100-800. So socketing may be a wise decision for the transistors.
...and a mojo layout with 1,2w carbon comp resistors for the purist...
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 32 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×4 | 100K | 100k | read from the layout by eye | |
| ×4 | 12K | 12k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×3 | 33K | 33k | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 150Ω | 150 | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 390K | 390k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 820Ω | 820 | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 8 | ||||
| ×5 | 100nF | 100n | read from the layout by eye | |
| ×2 | 680pF | 680p | read from the layout by eye | |
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 3.9nF | 3.9n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 5 | ||||
| D1 | 1N4148 | 1N4148 | legend: 1N4148/1N914; read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | legend: 1N4148/1N914; read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | legend: 1N4148/1N914; read from the layout by eye | |
| D4 | 1N4148 | 1N4148 | legend: 1N4148/1N914; read from the layout by eye | |
| D5 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | FS36999 | FS36999 | read from the layout by eye | |
| Q2 | FS36999 | FS36999 | read from the layout by eye | |
| Q3 | FS36999 | FS36999 | read from the layout by eye | |
| Q4 | FS36999 | FS36999 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Sustain | B100K | B100k | Potentiometer | read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | SPST | SPST | mid switch, toggle; read from the layout by eye | |
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