The Frog “Classic” Tube power supply is a compact power supply designed for preamp and low-wattage (1-2 watts) power output sections. It uses a Triad flatpack FP24-250 transformer that will allow you to plug in a 12VAC wall transformer power supply (or other equivalent 12VAC power source). Needs about 1000ma to 1500ma power capabilities. This was designed to power a Frog Tube Preamp 2.0 or Frog Tube Preamp 2.1 add-on PCB with a Frog Bigmouth output section PCB for a low-wattage bedroom amp. Documentation will be available soon!