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The 2159 is just a bottom of the barrel spec'd 215x-series VCA. You should be able to replace it with a 2155, 2150, or 2151. The specs, and therefore costs, increase as you go from 2155 to 2150 to 2151. These will still be hard to find, as they have been mostly replaced by the 2181 & 2180...

I used the recommendations in these comments to change the resistors. I can't recall offhand what values I went with, but I'll check next time I have it open.

Thanks for the build report, I've got one ready to be boxed and your mounting notes will be useful! I followed some recommendations on how to improve the Dwell knob from this thread. I'll have to check my notes and see exactly what I did, but it definitely delivers a more intense reverb sound...

Getting folks to take a systems approach always seems to be a struggle, for some reason it's harder to get capital for infrastructure upgrades than it is for "shiny new toys". I bet that 100W laser would cut through 1/4" acrylic like butter! Damn, that's a cool combo of materials & processes...

That looks nice! I've used the metallic Gravoply a few times, but it often had some odd & uneven texture on the unengraved areas. Maybe this thinner material is a bit more uniform, I'll have to give it a shot. What wattage are you working with on those Universal machines? We have two...

Yep, usually 1/16", occasionally as thick as 3/32" or thinner down to ~0.02"

At work we use Gravotech Gravoply and it's the most consistent in terms of quality and lasability (is that a word?). I can't remember which particular material type we use, probably Gravoply Ultra. If we can't get Gravoply, we'll use Rowmark, but it's a little more unpredictable in terms of...

I was wondering the same thing today. Somebody found some cases of leaded solder from before my work went ROHS and asked me if I wanted them. Now I've got 50lbs of Kester 44 just as I was running low...

I'm finishing mine up and have the same 386N vs 386L question. Did you end up testing both?

Is this circuit sensitive to JFET specs? I usually socket SMD JFETs on an adapter PCB, but I'm tempted to just solder them directly if it's not picky. I've tested & used a bunch of this SMD J201 batch, so I'm not worried about them being super out-of-specs or fakes.

Clean work, Dan0h! I'm building mine as we speak. Just a heads up, it looks like you missed a lug on the far right rotary switch ;):

Sounds great mate! Sounds like a decent amount of resonance available, and the filter sweep has that nice "velcro" edge to it.

We need to hear this thing!

For some reason it's really difficult to find small gauge pre-bond wire with any insulation other than PVC. I do like working with pre-bond, but no longer buy it due to the overwhelming advantages of a more flexible & temperature resistant insulation. In my experience, the majority of wire...

Go big or go home... Check out this list of elements sorted by density & choose away. Obviously the high transuranics like Dubnium & Hassium are the best bang for volume, but you might run in to some issues in terms of decay. As long as you're quick with your iron & have good health insurance...

I have the non-Stewmac version of this as well and it works great (and was much cheaper). It's super easy to flip from one side of the board to the other and the small jaws don't obscure much of your PCB footprint. Haven't had any issues with it other than it maxes out ~7-8" width if you're...

Mcknib is right, it should test most components without having to do anything funky - One exception is JFETs, where it will tell if you if it's N-Ch or P-Ch and the pinout, but won't give you VGSoff or Idss. You'll need something like a Peak DCA75 or the Greatly Improved JFET Matcher II. If...

This would be my guess as well, most of the through-hole J201s I've bought have also tested higher than their SMD equivalents. Interestingly, my through-hole 2N5457s tended to test lower than the SMD version. If you want to peak around at a bunch of different JFETs I've tested, I've shared a...

Post pics of the front & back of the board, maybe we can spot something.

After first spotting it in the preamp section of the Low Tide, I've been seeing this direct-coupled JFET-buffer setup a lot lately (Beetronics Fat Bee, JC-120 Preamp, JCM800 Emulator). Most of those circuits use it before a tone stack or into a power amp, and the Low Tide uses it to split signal...