The circuit is exactly the same in Electro Harmonix Axis fuzz and Guild's 2-knobbed Foxey Lady. 2N5133 may and will be very hard and expensive to source, so i'd suggest trying out any low hFE NPN Si transistors. Or go wild and try on anything you like. The cap values of 50µ and 4µ is another issue. Go with 47µ and 4.7µ. Should be close enough. I've added polarity protection and pulldown resistor, but you could omit them and save a column in order to make it verbatim with the original.
