Cepheid Chorus: NO WET SIGNAL!! (pls help)

[Itsjackbove]

hey y'all! i could really use some help
i started this build last night and "finished" it with disappointment. When its engaged, both LEDs work (even with the Rate knob) but ONLY my dry signal is coming through. I've seen similar threads with this problem happening but so far I don't see anything out of the ordinary from my build (at least none that stick out). I had originally used the V3207 / V3102 BBD/Clock chips and then switched to the MN3207 / MN3102 set just to see if that would make a difference at all but no luck

i tried messing with the trim pot too. When it's completely dimed/scooped, there's no dry signal at all and only comes back when i slowly bring it back in. So far i've been troubleshooting with it at noon.

the hot/ground, to the power switch are temporary. I was planning to rewire them once i diagnosed the issue but so far im getting clean, quiet power from the dc jack.

please let me know if you guys see anything that could be the main issue! thank u

 

[jwin615]

Probe pin 3 and pin 7 of the 3207. Those are the in and out. See if audio is getting to/from.
Also, careful handling BBDs this time of year. They're pretty esd sensitive.

 

[Itsjackbove]

Probe pin 3 and pin 7 of the 3207. Those are the in and out. See if audio is getting to/from.
Also, careful handling BBDs this time of year. They're pretty esd sensitive.

theres signal coming from both, ive been messing with the trim pot but im still not getting any luck

 

[jwin615]

theres signal coming from both, ive been messing with the trim pot but im still not getting any luck

K, probe at C17 and IC2 pin 6/7
That's the next two gain stages
You should have wet and dry at R35 and R34
They are mixed at IC2 pin 6 and buffered out at pin 7.

C17 is just after the wet gain stage before mixing. Should be louder that pin7 of the 3207

 

[Stickman393]

Keep that trimpot around noon while you troubleshoot, too. Too far off to the extremes and the BBD can stop passing signal.