COLORSOUND: The Yellow Hybrid OC140 Tone Bender by Jake Rothman

COLORSOUND hybrid tone bender vero layout d5ddcfffa8ad

Such a lengthy heading…   I’ve been waiting to find out what was going on with this one, and it has recently been traced on the Pedal PCB forum.  There’s also a great back story here, with some info on the Zener diode. The schematic can also be found via the Pedal PCB link above.  … Read more

Colorsound Hybrid Tonebender 2018 Edition

Colorsound Hybrid Tonebender Yellow NPN a578ad543de2

Couldn’t resist to draw a schematic and a layout for this interesting mutant of a circuit that just got traced.   First two gain stages is almost identical to a Jumbo Tonebender (except for one cap and one resistor value), the third gain stage is almost identical to the saturation stage in a Tonebender Mk. 3. … Read more

Tone Bender MKIII, Q3 Transistor Comparison (OC71, OC75, OC81)

Screenshot oc71 2 be801c1d1b0e

Now I didn’t go as far as measuring and matching gain and leakage (as much as possible), but here’s a comparison of a few Q3 transistors for a Tone Bender MKIII – all the same setting, just swapping Q3 on the breadboard. Why?   I saw someone on Facebook poking fun at an eBay seller in Thailand over what … Read more