Hello all, I spoke to soon saying I was finished with replacing the coax cable to the timing pod of the HP 5005A. I read the manual from cover to cover, and it appears some calibration is in order, at least some checking. Just guessing and I was tired, but my comprehension through that manual was only about 30%. I have a lot more reading, and things to look up before tweaking anything in the HP 5005A. I wonder if I have the right gear to even attempt this. HP didn't help using their 5036A Micro Processor Lab and a Pulse Gen. 100MHz with <2ns transition, I am quite sure I don't have these things or even a 300V power supply, and not likely to ever have them. I am hoping I can look at the input compensation and see if changing the coax affected the adjustments. If so, I will need a pulse gen that is fast and adjustable to the likes of HP8007B. any suggestions would be greatly appreciated, it can't cost BIG money either.