I wanted to make my NYC Big Muff reissue more versatile and bass-friendly so I decided to add a clean blend to it. I’ve used Buff’n Blend circuit by Joel Purkiss in the past with good results so I built one and slapped it inside the box. Now I can blend in clean signal to the distorted muff sound which helps me maintain bottom end. And while I was at it I changed the dc jack to a “normal” boss-style jack.
Since the enclosure is HUGE I also decided to add a switch to select between different eq shapes, one being stock mid-scoop muff and the other one much more flat&natural eq with slight bass boost. I remember reading about big muff eq mods in Jack Orman’s ebook (highly recommend it!) Switch selects between 22k (stock) and 100k resistor instead of R5 on the pcb board. You can see how this affects the eq curve in the pics. 100k sounds really good on guitar too as it cuts through the mix better.
These mods made it much more bass friendly and I get a nice dirty sound without losing bottom end. Another good thing is I can return to stock settings by flipping the switch and rotating the clean pot 100% clockwise. Now the pedal is one step closer to being an all-in-one box, maybe adding a compressor to it later because there is plenty of room left ;)
I modded a newer NYC Big Muff EC3003C board a while ago, added a picture of it at the end of the gallery. It had some changes compared to the old one:
– Slightly different values in tone stack (check the values from the pic)
– Different volume potentiometer (500kA vs. 100kB) for smoother control
– Wiring from footswitch to main pcb was ribbon cable
– Diodes were different type (1N4148 vs. 1N6263)
– Transistors were different type (BC550C vs. 2N5088)
Soundwise it was a bit more raspy in a good way. Probably because of the diodes. To this one I installed a 3-way switch to change the eq shapes between scooped/flat/bass boosted.