Enclosure not stated · 1 knob
Schaller Treble-Bass BoostVerified
Based on the Schaller Treble Bass Booster· 1 other board clones it
From the post
Not much info on this but, it's a rare West German Schaller vintage “Treble-Bass Boost” from 1968. It typically goes for over $400usd, so fairly desirable. It's a 2 transistor based booster, with a five position switch that controls the the frequencies being boosted. There's 2 treble settings, 2 bass settings, and 1 mids setting. Seems like it also gives a little bit of drive too, which is a nice addition.
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 · 1 value the reader of this layout was not sure of
- 25uF electrolytic lower right (col 16): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×3 | 47k | 47k | read from the layout by eye | |
| ×2 | 15k | 15k | read from the layout by eye | |
| ×2 | 10k | 10k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 2.2k | 2.2k | read from the layout by eye | |
| ×1 | 27k | 27k | read from the layout by eye | |
| ×1 | 470r | 470 | read from the layout by eye | |
| ×1 | 4.7k | 4.7k | read from the layout by eye | |
| ×1 | 330k | 330k | read from the layout by eye | |
| ×1 | 6.8k | 6.8k | read from the layout by eye | |
| ×1 | 100k | 100k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×3 | 220nF | 220n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 25uF | 25u | electrolytic; read from the layout by eye | |
| Transistors 1 | ||||
| ×2 | BC239C | BC239C | Q1-Q2, NPN; read from the layout by eye | |
| Potentiometers 1 | ||||
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | 1P6T rotary | 1P6T ROTARY | legend: 1Pole6Throw; read from the layout by eye | |
Other boards based on the Schaller Treble Bass Booster
- Schaller Treble Bass Booster Dirtbox Layouts