Lightning Boy Audio Thunder Knob. Here's your chance to own a piece of Lightning Boy history. This is the very first Thunder Knob pedal ever made. Its the prototype that started it all. Its been in use at LBA recording studio for over a year and is in perfect working order. This pedal has a higher B+ voltage than the stock pedal... nearly 220 volts. It also comes with a high quality USA-made vintage 12AX7 vacuum tube, fitted with a tube damper for reduced microphonic noise. If you're not familiar with this pedal, take a quick peek on youtube for "Thunder Knob pedal" or visit the Lightning Boy Audio website for full details. I'm auctioning this prototype, which I never planned to sell. At this moment in time I need to invest a lot into my company. May she find the finest of homes!