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The 7912AD is an oscilloscope variant built by Tektronix that at its time was way, way ahead of anything else anywhere ever in the way of high speed digitizing. They were essential for such things as military EMP studies and sold for anywhere from $42,000.00 on up each.
They basically accepted high speed 7900 series oscilloscope plugins and routed them to a bizarre double ended storage vacuum tube. The storage tube then converted the waveforms into ordinary NTSC video for plain old tv monitor display.
Thus avoiding the need for a staggering 12K bytes or so of RAM!
Thus, besides its original intended use, these beasties really, truly, and genuinely convert your television set into a giant, big screen oscilloscope. The storage tube would also appear eminently collectible. As would the entire units for the serious Tek collector.