Hi Ed, unfortunately the RF signal output connection is via a female SMA connector. The YTO 5086-7906 is built very well, as per HP tradition, and it is also easy to open it, having a little foresight and in a non-dusty environment.
I opened one of the two, broken, that I have, to check if inside there were any burn marks or gold wires, welded with the wire bonding technique, interrupted. Unfortunately, even with the microscope I did not find anything abnormal.
Opening the YTO is very easy: just remove the locked rear cover and unscrew the rear spacers.
The oscillator thus opens in two parts, the rear contains the two windings of the MAIN COIL and the FM COIL and the front contains all the electronic circuitry I believe on a sapphire substrate, including the ball in yttrium iron garnet.
Much of what I know I learned from reading the Keysight forum thread at: https://community.keysight.com/forums/s/question/0D52L00005IdorQSAR/hp-8560e-spectrum-analyzer-yig-yto- a11-questionproblem
