Mistress pases just clean signal

[Govmnt_Lacky]

@Jan

Can you repost with voltages while in Filter Matrix mode? This will eliminate the LFO and you should not see any of the voltages "swinging"

[R.G.]

... and both clock working fine (the two clocks seem to be in phase, hope that is all right)

Actually, this is not all right. I suspect from your scope pictures that they are out of phase or you would not be getting output. But BBDs need inverted clock phases to work.

Here are the voltages:

BC177 tranny
b. 11.82V
e. signal swinging around 2V ish
c. 12.41V

Check your pinout. I suspect you have confused collector and emitter. If not, something is quite wrong here.

[/quote]

[yeeshkul]

Thank you guys, i'll do this on Monday. Have a nice weekend! 

[yeeshkul]

Here are the voltages while in Matrix mode:

4558 chip
1. 6.56V
2. 6.56V
3. 6.5V
4. 0
5. 6.5V
6. 6.57V
7. 6.57V
8. 12.96V

LM339 chip
1. 6.54V
2. signal swinging
3. 12.96V
4. 6.57V
5. 6.58V
6. 4.28V
7. 7.78V
8. 0.08V
9. 5.59V
10. signal swinging
11. 0.43V
12. 0V
13. 0.02V
14. 4.27V

CD4013 chip
1. signal swinging
2. signal swinging
3. 0V
4. signal swinging around 3V ish
5. 0V
6. 0.02V
7. 0V
8. 0V
9. 6.46V
10. 0V
11. 6.53V
12. 6.46V
13. 6.46V
14. 12.96V

SAD1024 BBD chip
1. 0V
2. 6.56V
3. 6.46V
4. 0V
5. 12.95V
6. 1.16V
7. 12.96V
8. 6.46V
9. 12.96V
10. 6.46V
11. 12.96V
12. 1.16V
13. 0V
14. 6.46V
15. 6.56V
16. 0V

BC177 tranny
b. 11.82V
e. 12.41V (i swapped e and c last time)
c. 4,27V

[yeeshkul]

Do the voltages look ok to you guys?

[yeeshkul]

I've been  back to this recently. I can see only one solution - the BBD really is bad. Everything seems alright - the clocks are fine and out of phase, the buffer/amp is fine, just the BBD output produces volume changes instead of expected frequency changes. I mean it produces tremolo instead of vibrato.

[R.G.]

The definitive test for an SAD1024 being dead is if
(1) power supply voltages are correct
(2) clocks are clean and properly phased, and non-overlapped
(3) proper-level audio is present on the input
[... stage is set...]
and (4) no stepped audio comes out the output.