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Update: eq is now working, this is getting built

That's just how the amp was designed, the inverters are used to generate distortion (similar to a red llama, for example).

For some years now, I've enjoyed the sound of the Sunn Beta amps, but the EQ section was always a nightmare for me to create an etchable layout (I like etching my own boards), so now I've finally decided to breadboard a stripped down version to see if it sounds any good. Since I'm already...

Just finished my latest breadboard project, so timing feels right. I'll probably pester you with questions in the near future

I know I'm probably wrong here, but I like to avoid charge pumps as much as i can, and run everything on 9V. Any chance this will work ok on 9V?

Wow! That vero looks super clean!

Nice build report, @mybud !! I have built this one with 2n3819 and have found it a bit underwhelming (granted my 2n3819 vary wildly in specs - as do 2n3819 per the datasheet) I subbed in some 2sk304 (somewhat similar in specs to j201) and like it much better. It's still a bit too bright for my...

In his amazing thread about jfets, Chuck has lectured me briefly about transconductance information in datasheets (https://forum.pedalpcb.com/threads/jfet-biasing-part-1.5177/post-143159): what matters most are Vgs-off and Idss (that you use to calculate the gain of a fet stage). In the...

I'm guessing he's referring to C1-C5. I'm guessing the board was laid out to accomodate either axial or radial capacitors. There's continuity between the pads closer to each other

You've probably saved me from frying an IC in the breadboard (which is not to say I won't fry others)

Nice, Chuck, thanks for the input! I hadn't noticed the source pins at 4V, if I was to use only one of them (say the one with source on pin 7) as gain control, would it be possible to connect pins 9 and 4 to 0V?

Are you guys (especially Chuck, since I had originally posted it on the Boneyard) familiar with the Maestro Fuzztain? It uses the N-channel mosfets of the 4007 in parallel as a variable resistor in the compressor part, if I understand it correctly. Do you think there is a very solid reason for...

Love the colors on this one! Nice job!

Finally had the time to etch it. Will hopefully build it this weekend

First of all, that build looks amazing!! I'm looking forward to hear it in some of your amazing demos If I'm not mistaken (and I could very well be, it's late and I had a couple beers), the rullywow jfet matcher does not provide vgs-off values, but rather the voltage value at which the jfet...

+1 for Clube da Esquina! I find it to be one of those life defining albums

There's also one called Blüe Monster, by Vallhagen. It's not triple band, though, just two. Uses a cd4049 for generating distortion

For the time being, the plan is to build a single one, but even if I decide to build another, it's a simple circuit to breadboard and bias

I've been using 2sk304-C in place of J201 with good results. Not all of them will work perfectly, but a lot will For me, 2SK118-R are easier to find, and they are the same jfet in a different package With through hole 2sk fets you just have to mind the pinout (typically dgs instead of dsg)

I tend to take the same approach regarding the ground plane, but I've read somewhere that it could cause ground loops sometimes... I've biased the jfets on my breadboard. Q1, Q3 and Q4 are actually pretty matched, that's why the drain resistors have the same value, and as I'm taking it from...