Univibe clone troubleshooting

[Tadhg]

Hi folks, my first post. Please forgive me if I make a mess it.

For background/experience.
I built a tube screamer clone kit and it went reasonably well for my first time, a few small issues but I've got a working pedal. I've rewired a couple of guitars with push pulls etc. That's all of my electrical experience.

So I bought this univibe clone in link below.
https://guitar-electronics.eu/en_US/p/UNIVIBE-kit-ULTRA/173

I build it and it doesn't work. Any help or advice would be very much appreciated.

I have sound in bypass but nothing when I switch the pedal on. I have a little bit of what I'd call grounding noise, but the effect is out of the box in a pile on the table.

So far I've gone over all my solder connections, check components location, orientation.
I found I was missing a connection on my footswitch so I've fitted that.

Link to the schematic.
https://guitar-electronics.eu/en_US/p/file/3cc1e9b5253d4bb7b7d2f7301a4f0c4c/univibe-ENG.pdf

I read the troubleshooting guide and took the following measurements, all readings are volts.

16.55v at positive power input on board.
Q1 C=3.02 B=2.59 E=2.01
Q2 C=8.40 B=2.55 E=2.63
Q3 C=7.80 B=8.40 E=7.74
Q4 C=14.60 B=5.06 E=4.60
Q5 C=10.60 B=4.62 E=3.99
Q6 C=14.60 B=5.58 E=4.18
Q7 C=11.04 B=4.18 E=3.57
Q8 C=14.62 B=4.63 E=4.20
Q9 C=10.99 B=4.21 E=3.62
Q10 C=14.61 B=0.56 E=0.04
Q11 C=15.80 B=8.28 E=8.80
Q12 C=15.80 B=8.80 E=8.16
Q13 C=15.58 B=1.65 E=0.59

D1 a. 10.77  D1 c. 10.74
D1 a. 10.78 D1 c. 10.78

Tadhg.

[PRR]

Welcome!

Re-re-recheck R11 Q3 R9 R8. One of those is not what it should be.

[Tadhg]

Thanks a million for the reply, ill check it out later.

[franblanc]

Are you sure you are using enough input voltage. 9 volts at the jack will not be enough. That circuit is designed for 23 volts DC or 18 volts AC. There is a rectifier to convert the DC to AC and a L7815 voltage regulator to produce the DC into a nice steady 15 volts. Also check for ground loops as this might explain the hum. Do you have a flashing light bulb as that is the first step to a working Univibe pedal. Check see if the rate of flash responds to the speed control. Check your guitar input is wired correctly and lastly check the connections to the volume switch as they will kill att the output if the volume pot is faulty.