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Thanks @MichaelW ! Now I know what to listen for (y)

Thanks @dawson , Now I know better what to listen for :)

I took "leaf" sockets and cut in half using a box cutter. Carefully and round and round since one cut got a bit too eager. I made two pieces of 3 and one of 4 since I have been able to desolder 4 pins. But 7 might have been a challenge. I then filed them down on the top a little bit so there...

Super cool! AND cats...

Very nice build! You mention you like the TONE control, but I struggle to notice what it does? Is it affecting the reverberations as they decay out? So I need Long + much Decay and Atmosphere to hear it clearly?

Looks great! Just finished my assembly. I socketed the brick. Filing down socket halves as much as I could and carefully trimming the brick pins, also filing and cutting the solder points under the brick to a minimum. First test positive, will put it more to test once I have made decal and...

Sorry for being late to the party. Just finished the build part and the Tone pot does not do very much IMHO. Perhaps it is intended to "color" the reverberations as they decay out? Or it could be me just wanting to hear something too much that might not be there.

@steviejr92: Did you eventually figure out what was wrong with the build?

Sorry for being a bit late to the party. Did you manage to resolve your issue @motoburn ? And if so what was the problem?

How did this go? @jrh312

Thanks, yes I managed to find a few videos on Guyatone P-021 that it is based on as far as I know, and that showed the effect so I know what to listen for and try.

After soldering all up, I thought I could swap around the ICs in case on close to the Exciter pot was bad in some way, and turned out I had not pushed IC3 in enough, so I could swap them all back to first locations and still works now. I am not sure however what the Exciter should have as...

Thanks, will dig deeper

Just finished. Tested both guitar and bass and will go with guitar. Also the Sustain mod felt good. I noticed that the Exciter pot cut the sound in the extremes. I am not able to say how it affects the sound in the remaining interval , say 9:30 - 2:30 (ish). Is that normal?

I managed to get hold of: Q1: ACY30 hfe 82 leak 210uA Q2: SFT229 116 and 40uA Q3: 2N321 82 and 110uA Values might be tainted with my simple measuring device and lack of knowledge. So leakage might be off. But the names are correct. Especially q2 brings some goodness into the mix. Will avoid FZ-1

I had a similar experience. The Attack knob only matteret for about or less than half the range until I swapped for a log/audio pot instead. I also managed to get other transistors and they made a difference. I put in 3 dpdt switches so I could keep the stock ones and select each individually. I...

There is a mod for sustain, 27k + C500k. Did you consider it, or you feel that stock is good? I managed to get a Pumpernickel kit with another THAT (4301), and they also seem hard to find/are costly. Price went up quite a bit before I got it.

Which version did you build, guitar or bass? And did you try out to compare them first before soldering?

Thanks a lot for the detailed report and your thoughts! Will assimilate this for sure.

Thanks. Good to know. I was trying with an OTA (LM13700) as well, but got stuck for now, so will try other designs. I like the Zirconia quite a bit, so might be more optos in the future. Which 3 did you build? Any favourite (and why)?