Schematic diagram for any Beseler color analyzer

[Chan Tran]

I wonder if anyone has a schematic diagram for any of the Beseler color analyzer. Any model PM1A, PM2A, PM2L, PM2M, PM3L or PM4L etc.. They seem to use the same photomuliplier tube and I would like the basic circuit they used to get the raw output from the PM tube. I think modern opamp, logamp and comparator circuits for the later stages and modern digital panel meter would significantly improve them. I had several of these and want to tinker around with them.