Right on the money, it was the first transistor

Two things that I found
There's a really strong GNd loop hum in the pedal, don't know if it means anything

2. I injected a signal right after the first transistor and the signal was weak (also at the end of the modulation chain and signal was normal)

Thanks, I will check this section today

video

Added a video, the Roger mayer company do not support units that are over 10 years old.. didnt even supply a schem/voltage chart etc, kind of annoying, thank god for people who trace circuits...

hope anyone has any idea on how to approach this ?

I've had this one for a while, was working perfectly but now i get low output and the effect drops volume when engaged, bypass works, the Chorus/Vib/Trem modes all work but the sound has a very loud bass thump to it. I've attached a schematic i've found, I suspect the first Transistor because the LF...

Anyone?

i used 7812 instead of 7815 till it gets here... managed to find the voltages on the thread and chased down pin 7 on the ic, cause that was the the main culprit, found a missing link (using wires for the pots and one of them struck out and wasnt touching the board right. now all is fine, sounds KILLER

Im having a weird problem, i get no distortion, only clean sound when gain is off and when fully on i get no sound at all, volume and tone controls work My ic voltages are 1,2,3,5,6 are 0v Pin 4 is -15v Pin 8 is 12v Pin 7 is 11.41v Tube voltages 2.62v -12 -12 4 0v dc 5 0v dc 6 3.92 -12v -12v Any ide...

I've had this one for a while, was working perfectly but now i get low output and the effect drops volume when engaged, bypass works, the Chorus/Vib/Trem modes all work but the sound has a very loud bass thump to it. I've attached a schematic i've found, I suspect the first Transistor because the LF...

Email sent

fixed it.

pedal is fully working, problem was the jumpers, one of them lost contact.

all good now, thanks bajaman !

replaced the regulators, now getting -15v on the 79 and +12 on the 78 (using 7812, what i had on hand)

the IC voltages after replacing are

1:10.80v
2:10.84v
3: 10.94v
4: 10.91v
5: 10.83v
6:10.31v
7:10.87v
8:12.01v

these voltages are kinda screwy aren't they ?

I'm sorry for double posting, but I think more people are watching this thread: i started this thread here: https://www.freestompboxes.org/viewtopic.php?f=73&t=27877 now after some further testing i'm getting i'm getting -15.5v at the output of the 7815 regulator, the voltage should be positive ...

I'm getting at the input
17.2vAC

and after the diodes -23.1V DC

is it suspicious ?

regulator should be pumping +15v ?
polarity is fine on the diodes and capacitor orientation also looks ok, none are bloated or look damaged also.

primary suspect now is the regulator

hey all, i can't get any sound with this pedal, i've listed the voltages of the IC and tube , using 12ax7 and TL72CP IC: 1: -15v 2: -14v 3: -13.23v 4: -15.1v 5: -13.23v 6: -13.6v 7: -13.53v 8: -13.94v tube: 1: 0v 2: 12v 3: 11.5v 4: -3.9v 5: 0v 6: 0v 7: 11.8v 8: 11.3v 9: -5.3v do the voltages look ok...

also, do you think putting 100k instead of 47k on the anodes will yield different kind of distortion ? or will it be too much for a pedal to handle and will result in really low voltage to the anode ?

will this jack fit ?

http://www.rean-connectors.com/en/produ ... ks/nys2162

i ordered the ones from mammoth but the spacing is too wide for the pcb.

or does anyone have a part number for both jacs that fits firetcly ?

if all the knobs work as they should, check the transistor orientations.

check and replace them one at a time if you find a mistake.