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The one I bought for 30 bucks (including shipping) still serves me fine.
The one Qaiphyx linked looks like a good deal for about 100 bucks total. 200mhz dual channel the seller has a good feedback rateing and claims the unit works fine with a screen capture that shows a trace. If it's through paypal it's a very safe bet. I'd go as high as 150-200 I think. It's a 200mhz scope, and analog, Picoscope has nothing on that. Only bad part is no probes, so you're either stuck in the DC and low AC realm or you're going to have to build or buy probes.
If I could spare the money I'd bid myself.
Tektronix makes very good scopes. But if it breaks there is a manual online for it. https://bama.edebris.com/manuals/tek/475/
The 465B is also a very good scope and, though it is a 100Mhz unit, they typically are good to 150Mhz or so. Note that the scope doesn't come with probes. Working probes can be pricey, so check that out also.
It is considered a very good scope, but remember it may be more than 30 years old. There are things that age like capacitors and switch contacts, etc, that may need attention.
My Tek 2235 is from the '80s and another scope I had was entirely tube based, from the '60s and I only retired it about 4 years ago. So age is not a reason to walk away.
"The 465B is also a very good scope and, though it is a 100Mhz unit, they typically are good to 150Mhz or so."
That's a bit of a misleading statement. The specified bandwidth of the 465, 465M or 465B is 100MHz. Being "typically good to 150MHz or so" does not mean that they will be amplitude-accurate. Most 465s will have their 3dB bandwidth point over 100MHz, but not as high as 150MHz .... maybe more like 105 or 110MHz. Any higher, and the amplitude measurement will not be correct at all. Even at 100MHz, a barely-in-spec instrument will have an amplitude error of -3dB. A 465 is "good" to a lot higher than 150MHz. It will still trigger at those higher frequencies, still display the waveforms (fast-rise pulses will not appear as fast as they really are and amplitudes will be lower than they actually are) and you will still be able to use them to measure frequencies, although the 5nS/sec you can get at the 0.05µS TIME/DIV setting with the 10X horizontal magnifier on may not be fast enough to separate individual cycles for easy measurement.
I use Tek, HP and after-market probes such as these and find that as long as I'm the only one using them, they all last a long time. In a commercial setting, with many users, I would purchase Tek or HP only as they don't fall apart under heavy use.
The problem with buying such an old scope is a defect that is not is much talked about, namely gassy CRTs.
This is usually not a problem for viewing repetitive waveforms but when you have to turn the brightness up to view and trigger a single pulse the brightness is not there. As a matter of fact the easiest way to find this problem is to closely watch the trace as you increase the brightness, if it increases and then decreases as you turn the knob clockwise then the CRT is gassy,. You also see a focus change..
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