125B · 3 knobs
EHX Hot TubesVerified
Based on the Electro-Harmonix Hot Tubes· 8 other boards clone it
From the post
Here's the Hot Tubes overdrive from Electro Harmonix. It's based around a 4049 hex inverter chip (like a Red Llama) with a dual op amp pushing it. Original units from the 70s had buffered bypass and a direct out jack. I guess they needed something to fill up those massive enclosures EHX used back in the day. I've laid this out for a 125B enclosure with top mounted jacks and your favorite method of true bypass switching.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 34 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 17 | ||||
| ×1 | 1.2K | 1.2k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 430K | 430k | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| ×1 | 75K | 75k | read from the layout by eye | |
| ×1 | 8.2K | 8.2k | read from the layout by eye | |
| ×2 | 20K | 20k | read from the layout by eye | |
| ×1 | 150Ω | 150 | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 120K | 120k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 200K | 200k | read from the layout by eye | |
| ×1 | 1.8M | 1.8M | read from the layout by eye | |
| Capacitors 10 | ||||
| ×1 | 39pF | 39p | read from the layout by eye | |
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×1 | 180pF | 180p | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×1 | 120nF | 120n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×4 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | printed 4001; read from the layout by eye | |
| ICs 2 | ||||
| ×1 | CD4049UBE | CD4049UBE | read from the layout by eye | |
| ×1 | JRC4558 | JRC4558 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B2M | B2M | Potentiometer | read from the layout by eye |
| Tone | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Tone Bypass | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
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