Brad,
The 26.5 GHz input N connector connects directly to the input of the sampler assembly U1. The 500 MHz BNC input is a fused connector of which the body mounts directly to a printed circuit board on the rear of the front panel. For an illustration of the BNC assembly see page 6-3 of the service manual P/N 05343-90007
Jim,
I screwed up by calling out page 118 in the service manual in my last message. I had a HP parts catalog open at the time and noted that page instead. The actual page is 6-35 listing the only SMA connector found relating to the sampler driver assembly.
Greg
