A guy clearing out his deceased father-in-law's basement let me have an HP
1722A oscilloscope. It powers up, and responds to signals. I haven't
tested all the functions, but the basic stuff works. I'm thinking of
selling it. How much is a working 1722A worth?
I still have two functional 1725As. The problem is those old scopes have
hybrids in them. You need a spare scope to keep them going.
Actually I bought one working 1725A years ago. I found a cheap junker
for parts. My junker ended up supplying parts for someone elses 1725A.
[Gratis on my part because I'm just sooo nice.] So when the person
wanted to get rid of that 1725, I figured I better buy it since it had
all my parts in it anyway. Plus having a spare functional 1725A kept the
other scope scared shitless of being a parts scope, and then it never quit.
But I think I paid $100 15 years ago. Today you would be far better off
just putting the money into a Rigol than getting a 70's era HP scope.
I've turned down working Tek 7904s with all the plugins for $150. And
that was with the cart included. [You need the cart for those boat
anchors.]
But the 1722 is like the 1725 in that they are reasonably high
bandwidth. Sometimes it is nice to have an analog scope as a sanity check.
The delayed sweep is kind of funky on those old HP scopes. They weren't
particularly popular when they were new. The trigger was much maligned,
but I never found it to be as horrible as some stated.