Hey, I have just finished building the speedball upgraded Crack, but the voltage at the tip and ring of the heaphone jack jumps up to 15-20 V with a cold start. I've tried resoldering several joints, especially all the capacitors, but no luck.
The original crack worked, though I had a few weird readings: all the 90V read as 75V, and the 206V reading was at 21 (last one before the screw), not 20. The cold start heaphone read at 9V and everything else worked, and everything seemed to be in place, so I just kept it as is.
With Speedball installed, the cold start headphone jack jumps up to 15-20V. The 75V read at 68 and the 206V reading is stil at 21. I've tried re-using the resistance values from the crack manual, and they seem unchanged except terminals 7, 9, B3 and B6, which are over the limit of my voltmeter, but I assume it is due to the changes of the Speedball.
If anyone can help, it would be appreciated.