I got it from my brother-in-law, who was clearing out an estate. I had him send it to me, but had I known that all the amps were missing, I would have not bothered. The amp are essential to the integrators, and the whole point of analog computers is to solve differential equations with integrators. So, the chassis has the readouts, power supplies, user interface (that's all the knobs, lights, banana jacks, etc.), but without the amps there's not much to be done. I was pretty bummed when I opened it up to find them missing
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John