125B · 4 knobs
Catalinbread CB30 V2Verified
Based on the Catalinbread CB30 V2
From the post
Recently traced by Aion Fx, here is the 8 transistor version of CB30. It is supposed to be a very good sounding Vox-esque overdive. With 8 transistors it was quite difficult to keep the size down but it will fit into a 125b with no problem. Schematic, tracing journal and more info at Aion Fx.
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
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Check before you build · 2 values the reader of this layout was not sure of
- 1M drawn faded at column 16, rows G-I, overlapping Q6: counted as a resistor
- 1M drawn faded at column 4, rows L-N, partly under the 680nF: counted as a resistor
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×8 | 1M | 1M | read from the layout by eye | |
| ×6 | 470K | 470k | read from the layout by eye | |
| ×4 | 100K | 100k | read from the layout by eye | |
| ×3 | 2.2M | 2.2M | read from the layout by eye | |
| ×3 | 390Ω | 390 | read from the layout by eye | |
| ×1 | 3.3M | 3.3M | read from the layout by eye | |
| ×1 | 680K | 680k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 16 | ||||
| ×2 | 47pF | 47p | read from the layout by eye | |
| ×4 | 470pF | 470p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 680nF | 680n | read from the layout by eye | |
| ×2 | 1uF | 1u | film; read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | film; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×6 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×8 | 2N5457 | 2N5457 | JFET, Q1-Q8; read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | B1M | B1M | Potentiometer | read from the layout by eye |
| Treble | A1M | A1M | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |