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Hey all, Have been really wanting to get the Broughton HPF + LPF as my Q/strip HPF/LPF is not adjustable. But, realized that my Son of Ben has a HPF/LPF for the tone stack. Does anyone know enough about the Son of Ben to know if the filters there are comparable to a dedicated HPF/LPF like the...

I’m also finding that running the pedal at higher than 9v (12/18) also opens things up for bass. BUT it doesn't break up as well. Has way more headroom before breaking up.

Thank you! All good info. Maybe I'll start with the input cap and see where that gets me. And yes, I meant adding to C4 on the Greengage schematic.

Thank you for this! Very helpful. I have actually been building pedals for a while now, but I'm only starting to "understand" what I've been doing. :) Your series/parallel description with caps is something obvious that I never knew... and it goes a long way to explaining why pickups sound the...

I think it is in the opamp feedback loop... so that's interesting because the circuit is now amplifying too much of the low frequency. That makes more sense now. I wish I could breadboard this one, but I'm just not there yet and don't have time to figure it out now. Someday!

@Feral Feline what numbers do I want for bass? For example, in the below from the Greengage OD, I replaced C4 with 400N As is, the freq is 339hz (according to https://rc-calculator.glitch.me/) Change to 400n and the freq is 85hz, which is too low sounding. I'm still not sure what this...

I ended up adding a 300n to the 100n at C4. I think that might be too much. Makes the bass a little too much and the pedal jumps into overdrive with even the slightest turn of the drive knob. I'll have to crack it open again this weekend and switch that 300n out for maybe a 100n to make C4 200n...

Just messed with the biasing a little bit. I'm able to fine tune it some, but it's not so far off with the provided values. I wish that I could get it to be a little less spiky/splatty but I need to test it through a real world amp to actually see what it sounds like. Just put it back to...

For use with bass: I ended up switching out C6 and C8 for 330n (what I had on hand, though I think anything 100n and above would have been fine). That really opened up the pedal and makes it sound a lot fuller and more useful on bass. Also omitted C5 so that there's more gain before breakup.

I ended up switching out C6 and C8 for 330n (what I had on hand, though I think anything 100n and above would have been fine). That really opened up the pedal and makes it sound a lot fuller. At least on my bench rig, it sounds great! I rebiased the JFETs as well. I did that correctly when I...

Thanks for this! I've learned something tonight. Gonna give it a shot. Have you tried the mod to remove C5 for more gain before breakup on the drive knob?

John K suggested changing C6 and C8 to 100n

This one is even better: https://rc-calculator.glitch.me/ I'm just not sure what frequency I'm looking for here. Any thoughts?

Thanks @giovanni! I know nothing, but I did find this corner frequency calculator: https://www.omnicalculator.com/physics/cutoff-frequency#how-to-use-the-cutoff-frequency-calculator When I plug in the cap and resistor values... what cuff frequency am I looking for?

That makes sense... I'm not interested in making it work for guitar, only bass... so totally not worried about tweaking it. I changed the coupling caps on my muff, so maybe I'll just go that route here to make it more useable. Do I need to change the resistors that follow?

I built the SOB a year ago, but it's just not getting a lot of use on my bass board as it cuts too much bass frequency. Would changing C1 to 1UF be enough? It's currently 100n. https://docs.pedalpcb.com/project/SOBPreamp-PedalPCB.pdf EDIT: I ended up switching out C6 and C8 for 330n (what I...

Bumping this. Going to give that bass mod a go soon. Anyone tried it?

sweet build. I'd like to check that one out.

I honestly couldn't get the tone to change all that much, but it might have been user error as much as anything. Still, I will say that it took me a while to appreciate the Plumes, but I feel that it may be a situation where it's not so much that it cuts the lows as much as it boosts the mids...

I'm not sure why, but I couldn't make this work... it was kind of a half ass strategy anyway. That said, I've come to appreciate my plumes more lately. It's a fine standalone OD that does lose a little low end. However, I'm finding that it's really good as a sweetener before a muff. Really gives...