I've resumed the effort to revive a Crack amplifier that I built three years ago. It worked well in the standard configuration, and after installing the small Speedball board. After I built and installed the large board, the amplifier just wouldn't work, even after a number of posts on this forum, and actions to follow up on the advice given. Recently, I removed the large board, and reinstalled 3K wirewound resistors. The results of the resistance test were as specified in the Crack manual. I then checked voltages, as specified in the Speedball manual, with the following results: 0A, 57.2V; 1A, 192V; B-A/B, 0.3 mV; 1B, 179V, 0B, 192mV, with fluctuations. I reflowed the adjacent solder joints, and replaced the red solid-core wire between terminals A1 and 5U. Voltage reading were essentially the same. It appears that no power is reaching terminal 0B. Is there some other action that is advised? Thank you.