A one GHz Scope is quite the thing and takes expensive probes. Not very common.
A one GHz Spectrum Analyzer is more of a common unit. Lots of these in multiple brands.
The higher freq SAs like the one GHz one usually do not do KHz freq, And if they do go down to that, they don't usually do it well.
I missed that it was supposedly a 1GHz scope, I saw Hammeg and assumed it was something like a 20-40 MHz analog scope. 1GHz analog scopes did exist but the only ones I'm aware of were sampling scopes that were very specialized. I think the fastest conventional analog scope I've seen was 400MHz.
Tektronix made two non-sampling 1 GHz analog CROs, but they were not really conventional.
The 519 (from 1959) did not have vertical amplifiers, and needed 125 ohm drive directly to the vertical deflection, at 10 V/cm over a narrow height band.
The 7104 (from 1978) required a channel-plate to achieve a useful display at 1 GHz, which had a finite lifetime.
At least the 7104 could use a "normal" plug-in for vertical: 7A29, 50 ohm input, 10 mV to 1 V per division.
When I could have used such a beast (in 1983), I found that you could not rent the 7104 since it was far too easy to damage.