Slow Gear SG-1 vero build using cathexis layout = oscillation!

[jakehop]

Hi all!

My friends birthsday is coming up, so I wanted to give him something special. He always wanted a SG-1, but couldn't afford one, so as a surprise, I'm building one for him.

I'm using Cathexis' vero-layout, but I can't get it to work! All I get is crazy oscillation. I've tried reversing the transistors, tried other types (2N5088 instead of BC549 and 2N5457 instead of 2SK30A) but at no avail. I'm using the 549's and the SK30A right now. All I get is crazy oscillation that changes frequency when I adjust the trimmer or one of the knobs.

What's going on?! My voltages are at the end of this post.

Kind regards, Jake

Battery: 9.14V
This is the measurements with the pedal plugged in, but no signal going to it.

T1:
C: 9.14
B: 2.23
E: 1.72

T2: (2N5457)
D: 5.42
G: 4.92
S: 5.42

T3:
C: 9.14
B: 2.79
E: 2.23

T4:
C: 8.49
B: 1.21
E: 0.68

T5:
C: 5.39
B: 0.69
E: 0.69

T6:
C: 2.80 (with around 1.8V AC here - this might be the culprit!)
B: 0.80
E: 0.80

LM741:
1: 0.0
2: 4.52
3: 4.42
4: 0.0
5: 0.0
6: Can't get a DC reading with my meter - around 3.0V AC on this leg. Replacing IC didn't help
7: 8.56
8: 0.0

Trimpot:
1 (ground): 0.0
2: 0.96
3: 2.54

[cathexis]

Hi,
You may be the first to use one of my layouts! Your readings are very close to mine, apart from those you've noted. This means you're close. Check for solder bridges first - use a magnifying glass while shining a flashlight through the board. Then look for a misplaced component, starting in that area. You'll find something. I usually find that the pleasure of success is positively relative to the time spent debugging
LARS

[jakehop]

Hi Lars,

I have no doubts in your layout, and I normally enjoy debugging. But right now, time is sadly of the essence... AND I've got examns to prepare for next week. This might be a job for MacGyver.

Kind regards, Jake