1590B · 4 knobs
DeadAstronaut Bassman PreampVerified
Based on the DeadAstronaut Bassman Preamp
- Category
- Preamp / Amp-in-a-box
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Bass, DeadAstronaut, Preamp
From the post
Here's one for my fellow bassists out there. It's a transistor-ized version of the Fender Bassman preamp as modified by DeadAstronaut over on DIYSB. It's laid out for board mounted pots and switch and will fit nicely in a 1590B.
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 20 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- Treble and Bass pots B22k: printed clearly in the legend, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 680K | 680k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×4 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | printed 4001; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Potentiometers 4 | ||||
| Treble | B22K | B22k | Potentiometer | read from the layout by eye |
| Bass | B22K | B22k | Potentiometer | read from the layout by eye |
| Mids | B1K | B1k | Potentiometer | read from the layout by eye |
| Volume | A1M | A1M | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×2 | 100K | 100k | read from the layout by eye | |
| Switches 1 | ||||
| Hi/Lo | SPDT | SPDT | toggle; read from the layout by eye | |