Freshly delivered from eBay: a power supply, a diode, and a 6.5 digit KVD. Unfortunately, I can't find any information on the model, "PPM 412", with 1V and 10 V ranges, built in 1981. The board has points labeled 100V and 1000V, so I figure there were other higher voltage models. The left shield contains the zener reference (
it appears to be ovenized), while the right has the upper ranges of the KVD (with dozens of trim-pots). The output Cliff-brand binding posts were broken in transit (will be replaced with parts on hand, but eventually some Pomona 3770). Once I get it working, I'll post more photos.