My friend has a TA1600, and so do I. We need to do the cap replacements mentioned in other threads in this form. I do have a schematic. However, I do not have service manual with info to set bias - a web search disclosed dead links and no documents. I also tried to open the case but even after removing all hex bolts that I could see I was not able to crack the case. One issue is that I could not figure out how to remove the volume control knobs without damaging them.Does anyone have any info or advice that can help me?