The next thing I got to test was the first version of the amplifier section.
Same test as the first one, but this time with a pcb and test version of the output amplifier soldered.

And what I got was a nice 4V p-p 5MHz triangle waveform!

At that time I was still missing a lot of the components, so I ended up bodging other components that I had at hand to get the thing working somehow.