I have a total of four oscilloscopes.
The first one, a Tektronix 515 of which failed many years ago and was put to one side with the thought " I will fix that one day"
The problem is the EHT transformer, needs to be re-wound. I have the details of how many turns on each winding, I just lack the wire and the inclination to do it.
Cost about £100 in 1978.
The second, a Telequipment D75 is still in working order but has not been used since I bought scope number four.
It has needed one major repair, the EHT multiplier failed. A replacement multiplier was unobtainium, so I built one from scratch which has worke perfectly for about 15 years.
Cost £450 in 1984.
The third is a USB type scope which I bought when I started working for myself. I thought that there would be situations where it would be useful to have a nice portable scope.
The reality turned out to be quite different. I never really needed it.
There was one occasion where I was at a job and needed a scope, there was a scope available but it had no probes or suitable BNC-croc leads.
I did get by with single wires from the unit under test to the scope, not ideal but I managed.
Where was my scope when all this happened? Back home about 8000 miles away! Doh!
I now find it very useful when working on PICs. It is good at catching fast pulses.
Cost about £950 in 2004.
The fourth, an Agilent DSO3202A. Nice size, fits on the shelf above the work bench. 200MHz bandwidth and can connect to a PC via USB.
Cost 900Euro in 2012.
JimB