Based on the Alembic F-2B Tube Preamp. 
Built in pedalboard friendly format. 
12VDC Center Negative power supply. (enclosure shows 9V - it can be run on 9V but will not sound correct - 12V is the correct voltage)
Voltage is converted internally to 250VDC. 
- Mullard 12AX7 Preamp Tube
- True Bypass 
- Pedalboard Friendly Enclosure 
- 12VDC power supply included with purchase 
Comes with 1-year workmanship warranty.