The Joyo Vintage Overdrive JF-01 is a Tube Screamer guitar pedal clone.
I've checked it against the TS-808 Tube Screamer schematic, and what I've found is that it has the circuit, it also has the same components values of the Tube Screamer.
Indeed, at least to my ear, it's sounds like a TS-808.
But, because i would like to experiment a little, i apply some mod on this pedal.
I've basically given a little more distorsion to the pedal. I also add a "Fat" switch, to makes it sounds fatter, and I've replaced the two clipping diode with two 5mm IR leds. Also I've changed two electrolitics caps of this pedal with two film caps.
Below you can find my schematics.
I would like to thank my friend "Bond" that lends me his Tube Screamer clones, which I've used as reference in addition to a genuine TS-808 by Ibanez.
Notes
- read risk disclaimer
- excuse my bad english