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Limited Quantity! Original 1970's MXR Headphone Amplifier PCB.
Only a few available. When they're gone, they're gone!
This is a great headphone amp so you don't disturb the missus or the neighbors. Plug your guitar into the input and headphones into the output. Try using it as a pedal in your chain!
True bypass wiring can be found here: Griffin Effects Negative Ground True Bypass Wiring
Griffin Effects Silent Step Switching can be found here: Griffin Effects Silent Step
Original MXR Circuit Board
Layouts in instructions: