1590XX · 10 knobs
Enigma Preamp
Based on the Dumble Overdrive Special preamp
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From the vendor
A compact single-channel tube guitar preamp. Boutique Dumble ODS tone for your pedalboard! Two modes are available: Clean and Overdrive. A three-band EQ is common for both modes. The tone control offers several options for expanding tone shaping capabilities (Bright, Mid shift and Rock/Jazz). Option PAB is also available (preamp boost). Switching between modes and controlling PAB is accomplished using two buttons. ECC83/12AX7 or 6Н2П-ЕВ tubes (2 pcs) are used. 6Н2П-ЕВ/12AX7 switchable heater via jumpers on the tube board. Power supply: regulated mains adapter 12 VDC (load current of 1 A or more). To power the tube plates an internal DC-DC high voltage boost power converter is used (Nixie type). The dimensions of the main PCB 99 x 135 mm. Enclosure type: Hammond 1590XX.
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 65 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 19 | ||||
| ×1 | 820 | 820 | Metal film resistors 0.6W-S 820 Ohm | |
| ×2 | 1k | 1k | Metal film resistors 0.6W-S 1k | |
| ×1 | 1k5 | 1.5k | Metal film resistors 0.6W-S 1k5 | |
| ×4 | 2k2 | 2.2k | Metal film resistors 0.6W-S 2k2 | |
| ×2 | 3k3 | 3.3k | Metal film resistors 0.6W-S 3k3 | |
| ×5 | 10k | 10k | Metal film resistors 0.6W-S 10k | |
| ×2 | 22k | 22k | Metal film resistors 0.6W-S 22k | |
| ×1 | 68k | 68k | Metal film resistors 0.6W-S 68k | |
| ×6 | 100k | 100k | Metal film resistors 0.6W-S 100k | |
| ×1 | 150k | 150k | Metal film resistors 0.6W-S 150k | |
| ×4 | 220k | 220k | Metal film resistors 0.6W-S 220k | |
| ×4 | 1M | 1M | Metal film resistors 0.6W-S 1M | |
| ×1 | 2M2 | 2.2M | Metal film resistors 0.6W-S 2M2 | |
| ×1 | 4M7 | 4.7M | Metal film resistors 0.6W-S 4M7 | |
| ×2 | 22M | 22M | Metal film resistors 0.6W-S 22M | |
| ×2 | 150k | 150k | Metal film resistors 1W or 1W-S 150k | |
| ×2 | 220k | 220k | Metal film resistors 1W or 1W-S 220k | |
| ×1 | 470k | 470k | Metal film resistors 1W or 1W-S 470k | |
| ×1 | 2k2 | 2.2k | Metal oxide film resistor 1W 2k2 | |
| Capacitors 19 | ||||
| ×2 | 22p | 22p | Ceramic disc capacitor 22p 1kV | Ceramic disc capacitor |
| ×1 | 220p | 220p | Ceramic disc capacitor 220p 1kV | Ceramic disc capacitor |
| ×1 | 330p | 330p | Ceramic disc capacitor 330p 1kV | Ceramic disc capacitor |
| ×1 | 470p | 470p | Ceramic disc capacitor 470p 1kV | Ceramic disc capacitor |
| ×2 | 10n | 10n | Ceramic disc capacitor 10n 1kV | Ceramic disc capacitor |
| ×2 | 100n | 100n | Monolithic ceramic capacitor X7R 100n 50V | Monolithic ceramic capacitor |
| ×1 | 1n | 1n | Film capacitor (R=5mm) 1n 63V | Film capacitor |
| ×1 | 2n2 | 2.2n | Film capacitor (R=5mm) 2n2 63V | Film capacitor |
| ×1 | 4n7 | 4.7n | Film capacitor (R=5mm) 4n7 63V | Film capacitor |
| ×1 | 2n2 | 2.2n | Polypropylene film capacitor (R=5/7.5/10mm) 2n2 400V | Polypropylene film capacitor |
| ×1 | 4n7 | 4.7n | Polypropylene film capacitor (R=5/7.5/10mm) 4n7 400V | Polypropylene film capacitor |
| ×2 | 10n | 10n | Polypropylene film capacitor (R=10mm) 10n 400V | Polypropylene film capacitor |
| ×3 | 47n | 47n | Polypropylene film capacitor (R=10mm) 47n 400V | Polypropylene film capacitor |
| ×1 | 100n | 100n | Polypropylene film capacitor (R=10mm) 100n 400V | Polypropylene film capacitor |
| ×4 | 4u7 | 4.7u | Electrolytic capacitor 4µ7 25V 85°C | Electrolytic capacitor |
| ×2 | 10u | 10u | Electrolytic capacitor 10µ 25V | Electrolytic capacitor |
| ×2 | 22u | 22u | Electrolytic capacitor 22µ 25V | Electrolytic capacitor |
| ×2 | 10u | 10u | Electrolytic capacitor 10µ 400V 105°C Low ESR | Electrolytic capacitor; d10 h20 |
| ×1 | 470u | 470u | Electrolytic capacitor 470µ 25V 105°C | Electrolytic capacitor; d10 h14 |
| Diodes 4 | ||||
| ×1 | UF4007 | UF4007 | Diode UF4007 | |
| ×1 | 1N4001 | 1N4001 | Diode 1N4001 | |
| ×7 | 1N4148 | 1N4148 | Diode 1N4148 | |
| ×2 | diode BZX55C18 | BZX55C18 / 18V | Zener diode BZX55C18 | |
| Transistors 5 | ||||
| ×2 | MMBFJ177 | MMBFJ177 | Transistor MMBFJ177 | |
| ×1 | IRF740 | IRF740 | Transistor IRF740 | |
| ×2 | BC547C | BC547C | Transistor BC547C | |
| ×1 | BC557C | BC557C | Transistor BC557C | |
| ×1 | LND150N3-G | LND150N3-G | Transistor LND150N3-G | |
| ICs 1 | ||||
| ×1 | NE555 | NE555 | IC NE555 | DIP8 |
| Inductors 1 | ||||
| ×1 | Inductor CDRH127-221 MC 220uH 1,16A | INDUCTOR CDRH127-221 MC 220UH 1,16A | Inductor CDRH127-221 MC 220uH 1,16A | |
| Potentiometers 4 | ||||
| ×1 | B250k | B250k | Potentiometer Alpha RV16AF-20-17K-B250k | |
| ×3 | A250k | A250k | Potentiometer Alpha RV16AF-20-17K-A250k | |
| ×1 | A500k | A500k | Potentiometer Alpha RV16AF-20-17K-A500k | |
| ×2 | A1M | A1M | Potentiometer Alpha RV16AF-20-17K-A1M | |
| Trimmers 2 | ||||
| ×1 | 1k | 1k | Trimmer potentiometer type 3296W 1k | |
| ×2 | 100k | 100k | Trimmer potentiometer type 3362P 100k | |
| Switches 2 | ||||
| ×2 | Toggle switch SMTS-102-C4 On-On | TOGGLE SWITCH SMTS-102-C4 ON-ON | Toggle switch SMTS-102-C4 On-On | |
| ×1 | Toggle switch SMTS-202-C4 On-On | TOGGLE SWITCH SMTS-202-C4 ON-ON | Toggle switch SMTS-202-C4 On-On | |
| LEDs 2 | ||||
| ×2 | Blue bright (ultra bright) 3mm LED | BLUE BRIGHT (ULTRA BRIGHT) 3MM LED | Blue bright (ultra bright) 3mm LED | |
| ×2 | Red 5mm LED | RED 5MM LED | Red 5mm LED | leads length 25mm |
| Other 6 | ||||
| ×2 | tube 12AX7/ECC83 | TUBE 12AX7/ECC83 | Vacuum tube 12AX7/ECC83 | or 6H2П-EB |
| ×2 | Relay HFD27/012-S | RELAY HFD27/012-S | Relay HFD27/012-S | |
| ×1 | Heat sink RAD DY-CN-020 | HEAT SINK RAD DY-CN-020 | Heat sink RAD DY-CN-020 | 22x15x10 |
| ×7 | Connector PBS-4 | CONNECTOR PBS-4 | Connector PBS-4 | |
| ×2 | Connector PLS-2 | CONNECTOR PLS-2 | Connector PLS-2 | DS1021-1x2 |
| ×3 | Connector PLS-20R | CONNECTOR PLS-20R | Connector PLS-20R | DS1022-1x20R |