King Dubby Delay - Low output volume

[guidoilieff]

1.What does it do, not do, and sound like? Does everything fine except the low volume at the output and repetitions are distorted. After the 33ohm resistor the voltage drops from 8.50v to 7v
2.Name of the circuit = King duby delay
3.Source of the circuit (URL of schematic or project) = http://effectslayouts.blogspot.com.ar/2015/09/king-dubby-delay.html
4.Any modifications to the circuit? No
5.Any parts substitutions? 20k resistors replaced with 18k (20k are not standard values in Argentina)
6.Positive ground to negative ground conversion? N

Voltage at the circuit board end of the red battery lead = 8.50
Voltage at the circuit board end of the black battery lead = 0


Q1

I = 7v
G = 0v
O = 5v

Q2

C= 0v
B=3v
E=2.50v

Q3

C=0v
B=3v
E=2.50v

IC1 Tl072

P1 3.45v
P2 3.45v
P3 3.45v
. 0v
. 3.45v
. 3.45v
. 3.45v
. 7v

Q2 (pt2399)

5v
2.50
0
0
3
2.50
0.66
0.66
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50

Q3
Idem Q2

1N4007

Cathode 7v
Anode 0v

D1 and D2 1N4148

Cathode 0v
Anode 0v


I dont know where is the problem. I already replaced Ic1,2 and 3.

Thanks for your time. I appreciate it.

[guidoilieff]

Not even a guess?....

[guidoilieff]

Look at those transistor voltages. Are those weird values?

[nocentelli]

Look at those transistor voltages. Are those weird values?

Voltage at the circuit board end of the red battery lead = 8.50
Voltage at the circuit board end of the black battery lead = 0


Q1

I = 7v
G = 0v
O = 5v

If Q1 is the regulator, I is supposed to be connected to +9v which you've posted as 8.5, yet is only showing 7v so something is clearly not right there.

[antonis]

If Q1 is the regulator, I is supposed to be connected to +9v which you've posted as 8.5, yet is only showing 7v so something is clearly not right there.

Probably 7V appear after 33R resistor so a 45mA total circuit current should be considered OK..

[guidoilieff]

Look at those transistor voltages. Are those weird values?

Voltage at the circuit board end of the red battery lead = 8.50
Voltage at the circuit board end of the black battery lead = 0


Q1

I = 7v
G = 0v
O = 5v

If Q1 is the regulator, I is supposed to be connected to +9v which you've posted as 8.5, yet is only showing 7v so something is clearly not right there.

Probably 7V appear after 33R resistor so a 45mA total circuit current should be considered OK..

That's exactly what happens. Also tried 3 more delays and they all work fine with 8.5v.

[guidoilieff]

Did I miss something in my report? Everything looks fine? Would a picture help?

[Kipper4]

Schematic might help.

[guidoilieff]

Schematic might help.

Schematic http://www.freestompboxes.org/download/file.php?id=27021&mode=view