I created this PCB clone and inserted the components according to the schematic. GuitarDistortionPedalLayout_1.JPG GuitarDistortionPedalLayout_3.JPG GuitarDistortionPedalLayout_2.JPG Ready to Print PDF-files: GuitarDistortionPedalPCB_SolderSide.pdf GuitarDistortionPedalPCB_ComponentSide.pdf SprintLa...

Connect a fixed resistor e.g. 470 Kiloohms or a potentiometer e.g. 1 Megaohm to the input of the FF and see if the noise behaves the same as with the plugged in guitar.

Did you install transistors with selected gain?

but guitar volume at zero through the pedal is dead silent..

The internal noise voltage source of the transistor is probably short-circuited to ground.
Can you find a noise minimum in the control range of the guitar's volume control?

I have traced the following strip layout and compared the found circuit with the schematic from the post above. The circuits are identical except for a tiny deviation. In the strip layout a 1 Megohm resistor has been added between input and ground. RAH Rev2.jpg the Tone Stack is this one from the fo...

What are the dimensions of the board?

What measuring equipment do you have at your disposal,
e.g. signal generator, oscilloscope?
After a look in the schematic I would say that the dry signal path has about unity gain.
How much of the input signal comes out at the output.

George Giblet found a bug in the Reagun Distortion schematic that has the same switching circuit as the Overdrive.
It is also the same error in the schematic.
Thanks again George.
Here is the corrected circuit:

Hi George,

Thanks for looking closely you are right.

During the repair I found an error in the schematic, the resistance between terminal 5 of the OP-amp and the 4.5 volt point has a value of 470 Kiloohm and not 22 Kiloohm.

I guess I never got problem with shared hole and under part jumpers, especially when I use the thinner lead cut from the old resistors by Tayda.

No worries this is not a common problem but my personal problem.

Hi Ichabod_Crane checked your vero-layout and found the errors I marked in the image. To trace them I made a copy of your layout with the Lochmaster 4.0 layout program. This program provides a trace function which highlights the selected connections in color. I have moved the jumpers that used the c...

Great, now also the transformer voltages are known.

I have found these operating instructions for the ROZZ RGA 6TB/10TB in my documents.
This was a combo amp that a friend of mine had in his music shop in the early 1980s.

I had bought this amplifier in the 60 watt version in 1983 defective, the transformer was burned out. I have repaired it in the 1990 years and sold it. Now i have redrawn the very blurred original schematics on a request. Because the transformer was defective I could not measure the transformer volt...

Erok wrote in a previous post: DMB said they swapped out the old board for this one, then sent me the pedal back as "working""like new". I asked them to please look at the pedal again, DMB promptly went out of business. That's why there is not a schematic of a working schematic. I had found a DMP Le...

So, in the end that is really that the correct schematic? I tried to emulate it with the software, but I got low signal and an important cut of bass and very large treble roll off. The trimmer doesn't help much. Should it carry 4.5v at the J201 drain? According to Erok, this is in fact the traced o...

Gain pot connections look odd - output should be from lug 2 rather than 3?

Thanks, you are right I made a drawing mistake.

Finally, the redrawing of the traced schematic of the original board.

In the case of a breadboard assembly, unwanted couplings can be caused by the connecting wires.
Take a plastic or wooden stick and move the wires and see if the oscillation changes or breaks off.
I assume that you have checked the circuitry.