[Test-Equipment] HP 8568A or 8568B ?

[Gottfried Ira]

Hi all,

I intend to acquire a "reasonably modern" spectrum analyzer...
Apart from being an earlier version, is there a specific reason to
avoid the 8568A? Any significant differences to the 8568B?

A Google search yields lots of infos for "B" but not for "A".

Thanks,
    Gottfried Ira