Overdrive (Overdrive / Clean Boost)
The Marshall BB-2 Bluesbreaker II is an analog overdrive / Clean Boost pedal based on the Op-amp overdrive with switchable Blues (drive + tone network) and Boost (tone/drive network bypassed) modes; bass and mid preset internally, with Drive, Tone, Volume (Drive and Tone operate in Blues mode only) controls.
| Category | Overdrive (Overdrive / Clean Boost) |
| Circuit / based on | Op-amp overdrive with switchable Blues (drive + tone network) and Boost (tone/drive network bypassed) modes; bass and mid preset internally |
| Signal | Analog |
| Controls | Drive, Tone, Volume (Drive and Tone operate in Blues mode only) |
| Switches | Mode select: Boost / Blues |
| Footswitches | 1 |
| Bypass | True full passive bypass |
| True bypass | Yes |
| I/O | 1 x 1/4" jack input, 1 x 1/4" jack output, 9V DC input; input impedance 1 MOhm, output load impedance max 25 kOhm |
| Power | 9V DC centre-negative regulated, or 9V PP3 battery |
| Power draw | 8 mA |
| Battery power | Yes |
| Dimensions | 120 x 65 x 55 mm |
| Weight | 510 g |
Closest matches from other makers, by spec and circuit.