OK, some initial testing. More advanced testing later with the Heath IG-4244 Scope Calibrator.
First up. The 7A16A. Tiny bit of attenuator switch deck noise. That's to be expected. Will clean up fine. Thumbs up!
Next up. The 7A18A. This guy is solid! Thumbs up!
Last one. The 7A26A. Both Vertical position pots extremely noisy. No biggie. It will clean up. Thumbs up!
This guy is 200MHz B/W which exceeds the 100MHz B/W of the scope. And all these 'A' version plug ins have read out capability but the scope doesn't. But as shown does not affect their operation.
I feel like a kid in a candy store right now.