As I am getting closer to retirement I have been thinking about
buying a used spectrum analyzer since I will not have access to
one at work. Unfortunately I am not familiar with all the
models from say 5 to 15 years ago. Is there a good reference
describing the different HP/Agilent, Tektronix, etc. models and
which are good and which to avoid. A quick look on Ebay shows
HP 4195A, 8561E, 8562A, 8562B, 8563E,8565A, 8568B,8569B, 8591E,
8593E, and 8594E. Similarly for Tektronix 492P, 494P, 495P,
495A, and 2755P. Is there some kind of a used buyers guide
available. I understand spectrum analyzers at a moderate level
and realize the differences between frequency range, external
mixers, dynamic range, bandwidth etc. but finding the specs in a
manner that makes them comparable is hard. Thanks for any advice.

73, Larry W0QE