Honeywell model 356358-3?

[mini612]

Hello, I'm new here.  I found an old Honeywell Model 356358-3 continuous balance unit.  I am looking for the specs or schematic for this unit.  I plan on using mainly the Power Transformer for a project, but do not know the specs.  I know that it uses four tubes: two 12ax7 and 12au7, which I can assume that the filament is either 6.3v or 12.6v, and the metal can capacitor has three 10uf 450v so I am assuming that the HV is around 300-400v, but I am unsure.  Can anyone point me in the right direction?  I cannot find anything on this on the web.  Thanks