Gain, Tone, Volume
500mA @ 9vdc Warmup, 250mA @ 9vdc After Warmup
The Lab Rat is based on the original ProCo Rat, but the original JFET buffer has been replaced by a 12AX7 tube stage. It uses a typical LM308 opamp, and has a three-way clipping diode selection switch, which allows you to go between silicon diodes (standard Rat circuit), LEDs (Turbo Rat circuit), or no clipping diodes for a raw clipped op-amp sound.
Lab Rat also has a tube boost section after the drive that can be used independently for a nice clean boost or can be stacked after the drive to push the volume up for solos.