Can not believe it still works had it for 8 years now always comes in handy every now and then, one day will up grade to a hand held fluke 190 series.

CRO's do tend to keep on going as long as the CRT is good and the electrolytics are not past it.

I have a Trio dating from the 70's that needs a re-cap.

Trio CRO's are almost unbreakable and usually performed well above specification for bandwidth etc. In terms of analogue scopes, there are non better. Didn't make it across into the digital domain however, where Tektronix DSO's are possibly still the best prosumer brand of accurate, reliable oscilloscopes out there, albeit at a pretty high price. But then, the Trio's were not cheap either. I guess the old adage is true; you get what you pay for. A no name Chinese digital 'scope will work, but as to accuracy, durability and quality of construction.... {:o)

They can be interesting. A modern one here (Solid State) does not get far past its 10MHz then it all falls down (Chinese).

The ancient 2.5 MHz Heathkit OS-1 that needs another set of ecaps (all resistors & caps replaced), just keeps on going & just looses resolution. The fact that it has 6BL8's (the universal widget valve) which can be found in all sorts of places, despite it being a frequency changer, will have a lot to do with that.

The thing I did not like was the input caps 400V: They are now 2kV and don't use disk ones (noise).

Using an AC filament CRT was also looking for trouble.

Marc