Dang, that is some super clean soldering on the back of that perfboard! I hadn't heard of the TA-100 before, so I just looked it up and, unsurprisingly, yet another circuit has landed on my "to do" list.
On my workbench, I have a PoT (AionFX Achilles) and a Barbershop (Effects Layouts Tonsorium) just about ready to go into a 1590BB—it'll be my first two-in-one pedal. I plan to add an order switcher as well. Fingers crossed the PoT and Barbershop work well together for me!
I finished building my EAE Beholder and the DEFX Amnesia (ss/bs No Memory clone). I like both, but I'm not sure if I made them "right."
When I hit the strings hard or turn the gain up past 9 o'clock, the Beholder starts to clip in a way that sounds like my speaker is farting out. My guess is there must be an issue somewhere in my work on the circuit. I'm going to put this one down for now though—I spent far too much time troubleshooting what I thought was an error of mine on the board that instead turned out to be an issue with one of the practice amps I was using to demo the circuit. In any case, the Beholder sounds like a Reverberation Machine with waaaay more nastiness on tap, a wider range of tonal variation (it has a Filter knob as opposed to the Bright/Dark switch), and a momentary oscillation switch. I was happy to discover that I can also achieve a more straightforward reverb sound by dialing back the gain a bunch (this was something I hadn't heard demonstrated in any of the demo vids people have made of this pedal).
The Amnesia sounds really nice as well, but oh man did building it give me trouble. Turns out my I/O and DC jacks weren't the right size for the Tayda drill template I got from another user here. I should have double-checked my measurements! As a result, I had a crazy difficult time fitting everything into the enclosure. After fighting with geometry for a while, I eventually decided to re-drill those holes. To add to this, I had to wire the trimpot off-board in order to fit the CV jack in its place. It turns out you really do need the vertical/rectangular trimpots for this build—if you use one of the square ones (like I did), you simply can't fit it next to the CV jack.
As mentioned above, the Amnesia sounds good. I can get a nice slapback delay, bright-to-dark repeats, and wacky pitch-shifting goodness. Here are some minor issues I'm experiencing though:
- I wish that there were more volume in both the dry signal and the repeats. I get unity volume for the dry signal when the dry knob is at 4 o'clock and the wet signal never really gets louder than the dry signal even when dimed. I'm not sure if that's supposed to be the case or not. (I've noticed that the PT2399 delays I've made have quieter repeats than I'd like.) This also means that it's difficult to get long, droning repeats because the volume dies off too soon.
- I'm not sure I fully understand the "Range" knob. It seems that it just extends the, um, range of the Time knob when Mod is turned on. Maybe that's all it's intended to do? DEFX doesn't seem to have any more info on its site unfortunately. I've had a hard time finding more info about this elsewhere.
- I'm getting a fairly annoying switch pop. I'm not sure what the best way to go about diagnosing that is, but I'm reluctant to put this pedal on a board until I find a good fix.
- Brian (ss/bs) showed off some cool sounds the pedal can do in an old demo video he made. Comb filtering and chorusing in particular—I'm having a hard time recreating those sounds with the Amnesia.
All that being said, I have a couple ideas as to why I'm dealing with (1) and (4). First, I'm not sure I've dialed in the trimpot correctly. I might keep twiddling with that and see if it has an impact on gain and other fun delay/pitch/echo artifacts. Second, it could be a matter of the PT2399 itself. I've read they're quite a finicky bunch. I have a few others I can swap in. Third, I had to substitute D7 (a 3mm yellow LED) for what I had on hand (I chose a 5mm red LED). D7 comes off of pin 7 (Current Control 1) of the PT2399. I'm not sure if this was the correct way to go about identifying an appropriate substitute, but I read that 3mm yellow LEDs and 5mm red LEDs have similar forward voltage. I'm blindly hoping that relying on this factor was the right call.
Oh, and lastly, I have a 1590DD enclosure lying around. It's huge and I have no idea why I bought it or what ought to go into it.