1590BB · 5 knobs
From the vendor
The Ambassador is based on the Matchless Hotbox, which is a two-channel tube preamp/overdrive. The clean channel can work great as a warm clean boost, and the overdrive channel can go anywhere from a mild crunch to a creamy overdrive. Ambassador can be used either as an overdrive running into the front of your amp, or as a standalone preamp into a power amp, FOH, or interface.
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 36 rows
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ocr read from an image · sch paired from the schematic · fixed corrected by hand. Check marked values against the build document.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×1 | 560R | 560 | 1/4W Resistor | shopping list |
| ×3 | 1k | 1k | 1/4W Resistor | shopping list |
| ×1 | 1k5 | 1.5k | 1/4W Resistor | shopping list |
| ×3 | 2k2 | 2.2k | 1/4W Resistor | shopping list |
| ×1 | 4k7 | 4.7k | 1/4W Resistor | shopping list |
| ×2 | 10k | 10k | 1/4W Resistor | shopping list |
| ×1 | 56k | 56k | 1/4W Resistor | shopping list |
| ×1 | 68k | 68k | 1/4W Resistor | shopping list |
| ×3 | 100k | 100k | 1/4W Resistor | shopping list |
| ×4 | 220k | 220k | 1/4W Resistor | shopping list |
| ×3 | 470k | 470k | 1/4W Resistor | shopping list |
| ×1 | 1M | 1M | 1/4W Resistor | shopping list |
| Capacitors 12 | ||||
| ×1 | 56p | 56p | Ceramic capacitor | shopping list; 50V |
| ×1 | 100p | 100p | Ceramic capacitor | shopping list; 50V |
| ×1 | 180p | 180p | Ceramic capacitor | shopping list; 50V |
| ×1 | 560p | 560p | Ceramic capacitor | shopping list; 50V |
| ×1 | 1n5 | 1.5n | Film capacitor | shopping list; 50V |
| ×2 | 22n | 22n | Film capacitor | shopping list; 50V |
| ×2 | 22n | 22n | High voltage film capacitor | shopping list; 630V |
| ×1 | 100n | 100n | Film capacitor | shopping list; 50V |
| ×1 | 220n | 220n | Film capacitor | shopping list; 50V |
| ×1 | 1u | 1u | Electrolytic capacitor | shopping list; 25V |
| ×1 | 10u | 10u | Electrolyitic capacitor | shopping list; 250V |
| ×1 | 100u | 100u | Electrolyitic capacitor | shopping list; 25V |
| Diodes 2 | ||||
| ×1 | UF4007 | UF4007 | Ultra-fast rectifier diode | shopping list |
| ×1 | 1N5817 | 1N5817 | Schottky diode | shopping list |
| Transistors 2 | ||||
| ×1 | 2N3904 | 2N3904 | NPN General Purpose Amplifier | shopping list |
| ×1 | IRF740 | IRF740 | 400V 20A N-Channel MOSFET | shopping list |
| ICs 1 | ||||
| ×1 | NE555 | NE555 | Timer IC | shopping list |
| Inductors 1 | ||||
| ×1 | 100uH | 100uH | 100uH 2A Inductor | shopping list |
| Potentiometers 5 | ||||
| Bass | A1Msch | A1M | Potentiometer | |
| Dist | A1Msch | A1M | Potentiometer | |
| Treble | A1Msch | A1M | Potentiometer | |
| Gain | A1Msch | A1M | Potentiometer | |
| Vol | A250Ksch | A250k | Potentiometer | |
| Other 1 | ||||
| ×2 | 12AX7 | 12AX7 | Dual Triode | shopping list |