It helps a LOT to get a book called "Television Analyzing Simplified" by Milton S. Kiver. and published (c 1958) by B&K Manufacturing Co. The book patiently and exhaustively demonstrates every function of the B&K Analyst with lots of pictures and discussion. It touches on theory a little but for the most part aims at the practical service man and practical troubleshooting techniques using the Analyst. And of course it promotes purchasing the Analyst. The claim is that just it and a good oscilloscope are all you need to diagnose any TV problem. From what I've seen, probably true enough.
A couple of shots from past posts of mine on 3 different sets. The first pic shows a very nicely aligned and linear and level and centered TV (on its side, of course). The other two show various problems while resto work was in progress.
I bought two 1076's simultaneously on that ePay place, figuring I'd have to cannibalize one to get the other going. Turned out the first one restored fine with just a recap. The other one I never applied power to. Since then I found one completely MIB and museum grade. I put it under wraps for some later time and place.
The CRT inside displays a blank raster and shines it toward a phototube which picks up the emitted photons and re-mixes the detected beam with the sweep signal and re-generates a video signal (and re-modulates it, IF and RF)for export to your TV under test. Boring until a transparent slide with a black opaque pattern printed on it is placed against the CRT, which interrupts the photons at just the right time to reproduce the slide in the video out. Every electrical signal in this process is available via banana plugs or coax cables on the front panel, such that practically every grid of every tube in your vintage set can be driven by the analyst (instead of by the previous stage). It allows you to inject signals from every stage, front to back, in your TV and see the results ON your TV. By looking at the results you can narrow down to just a few components the problem with your set.
Only thing missing is support for the early split-sound audio. I guess they figured the '46-'49 sets weren't worth the extra circuitry...?
Most annoying drawback is keeping it calibrated (or getting it calibrated in the first place). Garbage in, garbage out on your unit under test doesn't help you troubleshoot much. If you have a good modern signal generator and frequency counter you can calibrate it though.