Verified layout of the black Ross Distortion made in Taiwan. It's based on this schematic.
To change it to USA (the "tan" colored version) spec just replace D1, D2 and D3 with 2 germanium diodes (1N270) to GND (move R5 to the left).
Possible upgrades: R60 & R61: 10k and C6 & C7: 100uF Elco.
Bill of materials
|R7: 500K Reverse log (C)|
|R8: 50K Linear (B)|
|3 jumper wires|
|9 trace cuts|
Click here to see the bill-of-materials as a list or download it as a comma separated values file (.csv).