Enclosure not stated · 4 knobs
Apocalypse Audio Thunder Tone
Based on the Apocalypse Audio Thundertone· 3 other boards clone it
From the post
From RnFR:
here's something i churned out the other day. i have been thinking about modeling the Supro Thunderbolt with FETs, but then thought- i just got in these cool new Tesla GE's, why not use those? so that's what it is, the preamp section of the legendary amp used by Page and supposedly Hendrix, done up NPN germanium style. i had to eliminate a few resistors towards the end to bring up the volume and lowered the value of an emitter resistor to up the gain a bit. also, i made the resistor on the input variable so you can adjust the input impedance for guitars with different pickups.
the real gem of this circuit is the tone pot- totally counter-clockwise you get a nice full range tone with plenty of mids. as you go clockwise it goes to a very muffled tone, and as you go even further, it goes to a very thin, cutting tone. there are some very cool sweet spots, and a lot of versatility. i like it better than a regular muff style control, but it does cut plenty of signal- hence the two gain stages after it.
it's a cool sounding circuit. nicely voiced and does a good overdrive type sound. if you don't have the trannys, you could change out the 33K Rc's to trimmers and adjust to taste. the tesla trannies are extremely consistent, so no trimmers needed. the layout below uses some large axial caps and is yet unverified, but hopefully i'll get it done sometime soon.
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 22 rows
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Check before you build · 4 values the reader of this layout was not sure of
- 3nF next to the 10nF (columns E, rows C-F): printed clearly, unusual value
- 500r at column E, rows I-L: printed clearly, unusual value
- 1nF at column M under the upper 22uF electrolytic: the can covers part of the text, reads 1nF
- 270k at column G-H lower left: partly covered by the 22uF can, reads 270k
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 47r | 47 | read from the layout by eye | |
| ×1 | 500r | 500 | read from the layout by eye | |
| ×2 | 2.2k | 2.2k | read from the layout by eye | |
| ×3 | 33k | 33k | read from the layout by eye | |
| ×1 | 100k | 100k | read from the layout by eye | |
| ×1 | 150k | 150k | read from the layout by eye | |
| ×1 | 270k | 270k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 3M3 | 3.3M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 3nF | 3n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 103NU71 | 103NU71 | try NPN Ge Transistors; read from the layout by eye | |
| Q2 | 103NU71 | 103NU71 | try NPN Ge Transistors; read from the layout by eye | |
| Q3 | 103NU71 | 103NU71 | try NPN Ge Transistors; read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Tone | B500K | B500k | Potentiometer | read from the layout by eye |
| Pre | A50K | A50k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the Apocalypse Audio Thundertone
- Apocalypse Audio Thundertone Dirtbox Layouts
- Apocalypse Audio Thundertone Effects Layouts (blog)
- Thunder Gun Express Sheepylove · €10.00