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That should be fine!

I'm guessing the value of C15 is not that critical and it's more about the properties of MLCCs compared to electrolytics, i. e. lower ESR and ESL for better performance at high frequencies, reduced ripple, etc.

Not too bad for commercial pedal builders considering the cost of the PCB is only one smallish part of what goes into the price calculation, but still kind of a big oof for guys like Robert who mostly just sell PCBs I imagine. Let's see what the future brings.

Feels weird. Like the end of an era. I don't like it, even though I've been using less and less Wima caps in my builds.

That's expected behaviour according to the schematic. Signal goes to the wiper of the trimpot and out from pin 3, so resistance goes down when turned CW and allows the cap to do more of its thing, i. e. throw away high frequencies.

I don't think a pull down will help much here. It's a basic treble booster into a multi gain stage JFET preamp. It's always going to be noisy. Trying different BJTs and JFETs might help.

Transcendence is a good option if you just want more volume but no coloration. Gain is adjustable from unity to +24 dB. I uploaded some samples in my build report here: https://forum.pedalpcb.com/threads/pedalpcb-transcendence-boost-creation-audio-labs-mk-4-23-clean-boost.24896/post-317445

Could also reduce R7 to 47K or so, or use a 100K trimmer to find your preferred setting. Lower values will shift the balance between the bass and treble controls to reduce the treble and increase the bass. It all depends on whether you think there's too much treble before or after the gain...

Now that's some good swarf right there. Mmmmhm.

That's a neat idea. Looks awesome!

Thanks, man!

It's a RAT with a clean blend and some extra tonal options. I like it but I don't love it. Clean blends on distortion effects aren't really for me, neither on guitar nor on bass. I just find it always sounds like two separate signals - which they are - and it's hard to make them sound cohesive...

I just built the Frajeelay yesterday where the weight control is basically this, but with a C1K pot. Cool and useful mod! I was curious how the 1K pot compares to Chuck's 5K pot, so here's a comparison within a simulation of the Frajeelay circuit. Top is 1K, bottom is 5K. So, smoother sweep...

I'm not Nostradoomus but I'll answer anyway :D 30p works fine ime although the datasheet says it needs a 47-56p comp cap for unity gain stability. You can up it to 150p, 220p or higher if it's too bright for your taste. With a 30p comp cap this chip sounds very different from the LM308 and OP07...

Yup, you're right. Forgot those are in parallel. I kind of think of the first gain stage in a preamp like an OD pedal for boosting the front of an amp. Dial in too much drive early on and it's going to sound too compressed, lack bass/highs and won't clean up properly because it precedes the gain...

Awesome, thanks! Yeah, this will be highly individual and depend on your tastes. Just wanted to get a general idea since I got the board sitting here as well waiting to be populated. I think Robert posted the original Model feT FETs were biased to 4.25V which just seems insane to me at ~17V...

Nice work and lots of possibilities for mods for sure. Since it follows such a basic tube amp topology, you could probably look at just about any early Marshall or Marshall adjacent tube amp for tone filtering inspiration and build it to suit your tastes - like you did :D What did you end up...

I did something similar with an active bass that I added a switch to that bypasses the active preamp. It also disconnects the battery so I'm not draining it needlessly in passive mode. The pop when turning it back on is quite substantial and while the capacitors are charging up there's no sound...

That's 67mA per rail, so 134mA total for the TEC 2. If current draw of one circuit is 120mA, even the TEC 3 won't work because it's limited to 200mA total. Edit: Had a quick looksie and TMR 6-0523 will provide more than enough current (200mA per rail). Input voltage is 4.5-9V, so some form of...