Aion Zenith "no sound"

[Petsku]

Hi. I've build LOTS OF pedals and Aion is my favourite... For the firtst time I have a problem, I can't solve: I don't have "scope", but by using an "audio probe", I can follow the sound untill IC3 / leg 1. After that the sound is veeery quiet and naturally adjusting volume trim pot won't help. The components after that have right values and I tried to change IC3, but no effect. Has anyboby had this kind of problem / found solution. I broke the Regen part from the PCB, afer I had soldered the switch to wrong side, but I fixed it by just leaving switch away, and now there is only R16 in the chain, so It is following the original schema.

I'm just about to make a "jig" for Jfet matching, but if I think this right, this is not a matching issue (and those 4 Jfets, I'm using (J113), should be matched) ? I found out, that J113 is not a perfect substitute for 2N5952 and I'm waiting for a 2N5952 matched quatro, but the sound should go thru despite what transistors I use, sholdn't it ?

[duck_arse]

welcome to the forum. but, we want more.

pictures of your build. a link to the build docs and schematic. voltages on your build. please for each.

[Petsku]

Thanks for yous answer. Here's a pic of the schematic and now my "old brains " remember, that I've had EXACTLY same problem with an 1981 DOD690... witch is funny. I had to make a jumper from that capacitor because there was a break / cut between C and IC. I'll let you know, if that was the case. Signal comes out from IC3 / leg1, but after that there is only a very silent sound.

Schematic on side 9:

https://aionfx.com/app/files/docs/zenith_documentation.pdf


And as You can see , I could not send that pic, but all information needed, is in the schema. - Petsku

[duck_arse]

pictures of your build.

your build, not the aion build. your voltages, not the aion voltages. the circuit diagram tells us what to expect, your pictures and your voltages tell us what we got.


these are the rules.