Precision Standards Corporation DC voltage calibrator

[daniel62]

Hi everyone, I'm a hobbyist and I enjoy buying ebay test equipment. The last purchase is a DC voltage calibrator that unfortunately got damaged with several broken components inside due to the unfixed power transformer. The brand is Precision Standards Corporation and the model 430A, on the internet I could not find anything, is there any of you who kindly knows this brand and has the scheme to understand what components are missing and the value of those broken? Thanks.