Dec 7, 2021
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RunOffGroove UBE Screamer
This is another great RunOffGroove project. It’s a unique twist on the classic Ibanez Tube Screamer. The UBE Screamer replaces the op-amps and transistor stages in the Tube Screamer circuit with inverters from a 4049UBE hex inverter.
I built this from a PCB I designed. The board is project on OSH Park. Check out the build Docs below. I used a black powder coat enclosure from Tayda electronics a red anodized dress nut and red anodized aluminum knobs from Lovemyswitches. I used the desktop mill to engrave the labels and logo through the powder coat.
Build your own!
Check out the build page for links to PCB Boards parts list and wiring diagram.
Read the build post here for PCB and parts: http://www.super-freq.com/ube-screamer-pcb-v1-1/
What does it sound like?
RunOffGroove UBE Screamer was originally published on Super-Freq
largaret margaret donezo and workin! love it when a thing works first try. i need to start doubling w/e biasing trimpot is called for, jfets are so sloppy w/ specs. its a ampeg sb12 jfet conversion, schematic by the wonderful folks at runoffgroove w/ some minor adjustments for my rig, namely the low pass filter at the output is less intense since i use a 15", an additional voltage divider trimpot at the input since my bass output is hot as fuck, its set to roughly 10%ish but it needs some addtl fiddling, and i retuned the tone stack very slightly to lower the bass boost a tad and move the treble control a tiny bit lower.
RunOffGroove 22/7 Build
Here is another 22/7 build. It’s a Big Muff variation. This unique circuit replaces the transistor stages of the classic Big Muff with CMOS inverters. It’s a unique flavor of Muff. CMOS inverters have their own unique flavor of distortion and have been used in many classic pedals like: Craig Anderton’s Tube Sound Fuzz, Way Huge Red Llama, Blackstone Appliances MOSFet Overdrive.
The 22/7 was created by the unstoppable genius over at RunOffGroove.com. They have a lot great stompbox designs and great information, be sure to check out their site.
Build your own
I designed the PCB and created a project over at OSH Park. Check out my build Docs to read more about the circuit and learn how to make your own! The PCB is designed with the the pots, switch and LED mounted to the board for ease of assembly.
Build post here for parts and PCB: http://www.super-freq.com/22-7-on-osh-park/
Build Process
For this build I used a powder coated enclosure and milled the labels and logo through the powder coating with a desktop mill. This process works for me and I can do everything myself at home with no chemicals and little set up and clean up. I want to give UV printing a try in the future, I’ve seen a lot great results! I’ll be writing a blog post about it in the future.
What’s it sound like?
Sounds a lot like a Big Muff but with its own character. The hex inverters have their own flavor but the strong clipping inherent in the Big Muff architecture dominates the sound giving it the characteristic Big Muff sound. I suspect you hear hex inverters as the last inverter is overdriven by the rest of the circuit. I’d say you get the classic Big Muff clipping sound but you don’t get the over saturated sound you can get with a Big Muff when the input is too hot or the sustain high.
The 22/7 has a switch that changes the range of tone control through three different ranges. This changes the range and sweep of the tone control to match other big muff models. There is a Classic option which is described as an average tone model of classic Big Muff models. A Flat option which creates a flat tone response removing the mid scoop of the classic mode, this is a well known mod. Last is the Scoop mode which creates a deeper mid scoop, I compare this to the sound of the original Way Huge Swollen Pickle.
I like the last mode on its own, but the flat mode sounds better with the band. writing this in 2021 I’m spending all of my time playing at home so all the modes sound great!
This has been my favorite Big Muff of late! It’s got a good sound and the tone control hits a very usable range.
RunOffGroove 22/7 Build was originally published on Super-Freq
22/7 on OSH Park
Built and test this second version of the 22/7 by RunOffGroove.com. Sounds good. This is a great alternative for Big Muff fans. The OSHPark project is public and verified.
22/7 is a Big Muff built around CMOS inverters in place of the transistors used in the traditional BMP circuit. The CMOS inverters have a tube like sound when over driven.
Order PCB here: 22/7 PCBs on OSHPARK
Parts List
CapacitorsC1 100µC2 33nC3 100nC4 220pC5 150pC6 150pC7 100nC8 100nC9 3n3C10 6n8C11 10nC12 10nC13 100nC14 150pC15 100nDiodesD1-4 1N914D5 1N5817D6 LEDICIC1 CD4049UBEResistorsR1 100KR2 470R3 1MR4 1KR5 33KR6 1MR7 33KR8 1MR9 39KR10 27KR11 1MR12 1MR13 330KR14 100KR15 RLEDSwitchRANGEON OFF ON PotsSUSTAIN A100K 16MM TONE B100K 16MMVOLUME A100K 16MM
Parts
Wiring
If you don’t want to build your own this one is for sale on Reverb.
22/7 on OSH Park was originally published on Super-Freq
UBE Screamer PCB v1.1
This is the second version of the UBE Screamer board. This version fixes a mistake with the reverse polarity diode. I’m calling this ready for public consumption and will add it to the OSH Park projects pages soon.
The enclosure is grounded through the jacks. The bottom cover though doesn’t make an electrical connection to the main enclosure body due to the powder coat. I used a drill bit to remove the powder coat inside the count sink recess, this allows the screw to make contact with the back cover for full shielding.
Order PCBs at OSH Park
Partslist
CapacitorsC1 10nC2 2n2C3 470nC4 100nC5 1n5C6 150pC7 100nC8 100nC9 100nC10 100uDiodesD1 1n4148D2 1n4148D3 1n5817D4 LEDICIC1 CD4049UBEResistorsR1 1M 1MR2 470kR3 470kR4 100kR5 100kR6 10kR7 1mR8 10kR9 100kR10 100kR11 100kR12 220kR13 Rx (see note)R14 330R15 RLEDPotsTONE B500k 16MM VOL B100k 16MM GAIN B500k 16MM
UBE Screamer Parts list
Wiring
Build your own! Check out my OSH Park projects page. Or buy this one at my Reverb shop.
UBE Screamer PCB v1.1 was originally published on Super-Freq