1590XX · 4 knobs
From the vendor
Nobelium is a low-noise, high-quality, studio-grade clean preamp and D.I. It has a nice wide frequency response to be perfect for bass or guitar, and includes a switchable HPF to cut down on unnecessary rumble.
Each PCB also includes two “12AX7-LEFT” PCBs for mounting the tube sockets and a D.I./XLR PCB for mounting the XLR jack, ground lift switch, and D.I. transformer. As of July 2024 I am adding the option to include a D.I. transformer for additional cost. This transformer is the Unagi E4305, the same transformer used in the Sushi Box FX Finally v2, Venus Z, and Grand Slampegg.
Schematic
The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 53 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 26 | ||||
| R8 | 560R | 560 | 1/4W Resistor | |
| R3 | 1k | 1k | 1/4W Resistor | |
| R4 | 1k | 1k | 1/4W Resistor | |
| R6 | 1k | 1k | 1/4W Resistor | |
| R14 | 1k5 | 1.5k | 1/4W Resistor | |
| R15 | 1k5 | 1.5k | 1/4W Resistor | |
| R16 | 1k5 | 1.5k | 1/4W Resistor | |
| R20 | 1k5 | 1.5k | 1/4W Resistor | |
| R24 | 1k5 | 1.5k | 1/4W Resistor | |
| R26 | 1k5 | 1.5k | 1/4W Resistor | |
| R1 | 2k2 | 2.2k | 1/4W Resistor | |
| R21 | 2k7 | 2.7k | 1/4W Resistor | |
| R7 | 4k7 | 4.7k | 1/4W Resistor | |
| R23 | 6k8 | 6.8k | 1/4W Resistor | |
| R5 | 10k | 10k | 1/4W Resistor | |
| R11 | 18k | 18k | 1/4W Resistor | |
| R22 | 18k | 18k | 1/4W Resistor | |
| R13 | 47k | 47k | 1/4W Resistor | |
| R2 | 220k | 220k | 1/4W Resistor | |
| R9 | 220k | 220k | 1/4W Resistor | |
| R10 | 220k | 220k | 1/4W Resistor | |
| R18 | 220k | 220k | 1/4W Resistor | |
| R12 | 1M | 1M | 1/4W Resistor | |
| R19 | 1M | 1M | 1/4W Resistor | |
| R25 | 1M | 1M | 1/4W Resistor | |
| R17 | 10M | 10M | 1/4W Resistor | |
| Capacitors 14 | ||||
| C3 | 100p | 100p | Ceramic capacitor | 50V |
| C6 | 270p | 270p | HV Silver mica capacitor | 500V |
| C4 | 1n5 | 1.5n | Film capacitor | 100V |
| C8 | 4n7 | 4.7n | Film capacitor | 100V |
| C5 | 4n7 | 4.7n | HV Film capacitor | 630V |
| C9 | 100n | 100n | Film capacitor | 100V |
| C7 | 100n | 100n | HV Film capacitor | 630V |
| C10 | 100n | 100n | HV Film capacitor | 630V |
| C11 | 100n | 100n | HV Film capacitor | 630V |
| C13 | 1u | 1u | Electrolytic capacitor | 50V |
| C12 | 2u2 | 2.2u | HV Electrolytic capacitor | 250V |
| C1 | 10u | 10u | HV Electrolytic capacitor | 250V |
| C2 | 100uF | 100u | Electrolytic capacitor | 25V |
| C14 | 220u | 220u | Electrolytic capacitor | 16V |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode | |
| D2 | UF4007 | UF4007 | Ultra-fast rectifier | |
| D3 | 1N4007 | 1N4007 | Generic rectifier | |
| Transistors 2 | ||||
| M1 | IRF740 | IRF740 | N-Channel MOSFET | |
| Q1 | 2N3904 | 2N3904 | NPN Transistor | |
| ICs 1 | ||||
| U1 | NE555 | NE555 | Timer | |
| Inductors 1 | ||||
| L1 | 100uH | 100uH | 100uH 2A Inductor | |
| Potentiometers 3 | ||||
| Bass | A250k | A250k | 9mm Potentiometer | |
| Treble | A250k | A250k | 9mm Potentiometer | |
| Volume | A250k | A250k | 9mm Potentiometer | |
| Switches 1 | ||||
| Rolloff | SPDT | SPDT | Switch | |
| Other 2 | ||||
| V1 | 12AU7 | 12AU7 | Dual Triode | |
| V2 | 12AU7 | 12AU7 | Dual Triode | |