Muzzle (Classic) distorting

[Ngor]

Please help! I wired up my Muzzle with the THAT4301 retrofit module today, and rather than reducing volume, it sounds like a crazy fuzz. The LED stays green. Turning the pot doesn't affect the sound. I used the switching jacks linked in the build doc, and confirmed with a multimeter that the switching contacts are working. After reading the other posts, I tried the alcohol wash and reflowed a bunch of joints--no change in function.​

TL072
pin 1: 21.9 mV
pin 2: 0.5 mV
pin 3: 0.2 mV
pin 4: -8.57 V
pin 5: 4 mV
pin 6: 7.6 mV
pin 7: 7 mV
pin 8: 9.11 V

LT1054
pin 1: 9.11 V
pin 2: 4.85 V
pin 3: 1.1 mV
pin 4: -4 V
pin 5: -8.62 V
pin 6: 2.54 V
pin 7: 1.83 V
pin 8: 9.11 V

THAT
pin 1: -3.5 mV
pin 2: -7.02 V
pin 3: moving mV
pin 4: 1.83 V
pin 5: -0.37 mV
pin 6: 0.3 mV
pin 7: 0.72 V
pin 8: 0.1 mV
pin 9: 0.1 mV
pin 10: -8.57 V
pin 11: 9.11 V
pin 12: -7.31 V
pin 13: 80 mV
pin 14: 0.72 V
pin 15: - moving mV
pin 16: 0.2 mV
pin 17: -4.8 mV
pin 18: -7.29 V
pin 19: -6.7 V
pin 20: 0.8 mV

 

[Ngor]

And pics

 

[Elijah-Baley]

Is the input sleeve not connected with a wire?
Are you sure that is in contact with the ground? Maybe I wrong, but I'm afraid the paint could isolates it from the ground.

 

[Ngor]

Is the input sleeve not connected with a wire?
Are you sure that is in contact with the ground? Maybe I wrong, but I'm afraid the paint could isolates it from the ground.

Good idea, but the jacks have a good connection through the case. I should have mentioned that bypass works fine. The problem comes when I engage the circuit.

 

[Ngor]

update: just for fun I reflowed even more solder joints, and then put everything back in the enclosure...at which point I noticed one of the unused lugs on the key input jack was touching the THAT board. So I bent that out of the way and stuck in a layer of electrical tape for the just in case.
Works now!

 

[music6000]

update: just for fun I reflowed even more solder joints, and then put everything back in the enclosure...at which point I noticed one of the unused lugs on the key input jack was touching the THAT board. So I bent that out of the way and stuck in a layer of electrical tape for the just in case.
Works now!

Well that will do it but the voltages you were getting on theTL072 were way off!
1,2.3,5,6 & 7 should have been around 4 to 4.5v!, 4 should be 0v, thats' Ground.

 

[benny_profane]

Well that will do it but the voltages you were getting on theTL072 were way off!
1,2.3,5,6 & 7 should have been around 4 to 4.5v!, 4 should be 0v, thats' Ground.

It’s a split rail supply circuit. The TL072 is fine.