Here is another oscilloscope. I designed and made this over 17 years ago and the circuit boards have been sitting in my junk box ever since. This evening I resurrected the boards by replacing/fudging replacements for the various components that have been salvaged from them over the years, found a couple of suitable power transformers and wired it all up as originally intended. About 14 years ago the junk box spent a winter in the rain, which is why the boards are corroded through the conformable coat. Though whoopie, it still works!
The CRT is a 1" model, part #913. The time base is of the injection-locked sort, utilizing a 555 timer in conjunction with a constant current source to deliver a linear sweep waveform for the horizontal deflection. And wow, I even implemented retrace blanking, so that the retrace isn't visible no matter how far up you turn the brightness control.
I was still a bit wet behind the ears when I designed this, but I've posted the circuit diagram below anyway. For the sake of nostalgia I'm going to amend/improve the overall design, layout new boards and build it into a proper/finished instrument enclosure.