I do wish they would resurrect the 7000 series approach to the problem. :)

In the Tek 7000, which came out about the time I was in high school, 
you bought a mainframe with or without storage, rack or portable, and 
variable number of slots. Then you added the appropriate vertical 
amplifier, timebase, spectrum analyzer, etc etc etc, and made the 
instrument that you wanted.

I frequently use mine with a spectrum analyzer, tracking generator, 
and vertical amplifier all at the same time.
And I greatly prefer the analog spectrum analyzer, which is a swept 
receiver,  to the DSP versions.
30 years old, and still a nice piece of gear.

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