The 465 has a CH1 output at the rear panel and if you connect a frequency counter here you can use the scope as the front end of the frequency counter via a x10 scope probe. This allows you to 'see' the waveform (on the scope display) as you are probing with the counter. The other bonus is that the CH1 connection at the rear has some voltage gain and this can help boost the sensitivity of the counter. You can also connect a spectrum analyser to the CH1 rear BNC and look at waveforms in the time domain on the scope and also the frequency domain with the analyser. All with a single x10 scope probe connected to the 465.
I can't remember if the 1740 can do this or not... I haven't used one for maybe 20 years. If I see an image of a 1740 I just think of worn out or missing controls on the front panel and I also remember how much I cringed when one of these unreliable old duffers was the only scope I could get immediate access to at work.
The "rule of thumb"used to be:-
Oscilloscopes, go for Tektronix, & for RF stuff, use HP.
It really turned out to be correct on many occasions.
When I was at a depot which looked after TV sites across Western Australia, we often carried a Tek 465 or similar, & a HP 180 series mainframe with a Spec An plugin.
We could have just carried the ordinary 'scope plug ins, but that would have meant swapping around.
The 180series seemed quite a good device, but if you wanted a 'scope, you normally reached for a Tek.
I've only used a 1740 a couple of times, & it seemed OK, but I also remember there being a "dead" one sitting around for ages.
That Ch 1 output is one of the most useful & versatile things when it is provided.
The Iwatsu we had at my later job in Commercial TV had one, too.
One of our routine tests was to look at the depth of modulation of the low frequency subcarrier associated with the TV stereo sound system.
From memory, the modulation on this was : no mod - mono, one frequency stereo,the other one, dual sound.
The subcarrier output from the R & S precision receiver was too low to look at the envelope, so it was into Ch1,then out, & into Ch2.
It was still a bit "furry", but you could clearly see & measure the modulation envelope.