Aion Fx Theseus issues - King of tone

[eurobailey]

I built the aion fx KOT about 4 years ago and its been the bane of my pedal building journey!!!

The first time my issue was a solder bridge on the switch. Once fixed, the pedal worked however on side B i get the boost and drive settings but not the distortion setting. On Side A i get all three settings working as they should.

My tests so far have been checking FV of the diodes in circuit (no power) to ground and they seem ok. The hard clipping diodes are 1n914 in my build.

I have also checked continuity between the diodes and the switch. So i get continuity with the switch UP or DOWN with the respective diodes.. which seems incorrect however i get this on Side A and B and have no issues with Side A?

i am assuming i have a faulty switch or a solder bridge somewhere but i am a bit stumped as what my next move should be? Would love any suggetions.

Today I unsuccessfully tried to remove the dip switch… I will try again tomorrow but also wondering what else I can try to get this to work ? Someone suggested running a wire on both sides of the “hard clipping “ switch to permanently have the diodes in the circuit but this didn’t seem to have any impact.

I am using Revision A from aion FX. This is the schematic.

https://aionfx.com/app/files/docs/theseus_documentation_v1.pdf

 

[eurobailey]

I've had two Aion PCBs with defective solder traces, on their MT10 clones.

I suggest you use a DMM set on resistance and beep and check for continuity between the DIP switch points (testing the switch itself) and then point to point through the path of the diodes. Replace the switch if you find it does not work, and jumper any 'open' circuit traces.

I felt like I did this and didn’t really get any conclusive evidence ! I seemed to get continuity where i should but the issue was still present. As a result, I cut my losses… I salvaged what I could from the build and I’ve started repopulating on stripboard ! About 75% of the way there!

I’ve decided to socket the second channel hard clipping section and try some bat 41 ones in there for a bit more grunt on the distortion . I was thinking maybe asymmetrical clipping as well. Any thoughts here anyone?