As far as I know, the 3458A was bought by the thousands by defense and
space organizations. I'd guess no-one else would support that kind of
development. Well maybe the telecom sector if there was a need for
such an instrument.
>
> No one else ever will. *WAY* too expensive for even Keysight to redesign 
> these days.  Just is not going to happen...
>
> Could you say a bit more about this? Did the 3458A not make economic sense 
> for HP at the time? Is nobody buying 8.5s these days? The reason I ask is 
> that I think we all have the general sense that as technology advances, 
> getting to any particular  design objective gets slowing easier as the years 
> roll on. This would be an interesting data point to illustrate why that isn't 
> always so. Possible to say more?
>
> Alan
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