The Fairfield Circuitry Barbershop is one of my favourite overdrives, although I am yet to try this version. There’s some subtle difference to version one, and it has a tone control, similar to the Millennium version. I think the most significant difference is the change to the output buffer.
FAIRFIELD CIRCUITRY BARBERSHOP VERSION 2 – VERO LAYOUT
TEARDOWN & SCHEMATIC BY GRAY BENCH ELECTRONICS
Credit to Gray Bench Electronics for both the video and schematic below. Check out his channel on YouTube, as there’s great stuff there.
FAIRFIELD CIRCUITRY BARBERSHOP VERSION 2 vs V1- LTSPICE
Comparing version one and version two doesn’t show many differences, apart from the tone switch, which is kind of obvious what that does. From what I can see, the frequency response of version two has a bit more bass. Removing the 2N2222 collector voltage supply from the sag control seems to have made the biggest difference, and the emitter was attached the volume control as well. I guess it’s more stable this way.
This is the two side by side with the sag control swept, gain on 100%, tone control left off on V2.
The frequency response stays pretty flat on both, apart from a bit of bass roll-off. I’ve forgotten which one is which below – one is sweeping the sage, the other the gain.
Version 2 with tone switches on. 10n first, then 47n. 47n looks a bit steep for me. When I made a Millennium Edition work-a-like I used 3.9n and 12n, and that was enough for me.
