Hi, I found the manual for the HV Power Supply (0-300 VDC, 0-50V DC bias, 12 VAC). It's at:-
www.ebaman.com
on the web. I believe you have to register to be able to download. Anyway, the file name is ECI_20600-20620_Hi_Voltage_Pwr_Sup. (Just search on ECI_20600 after LOGGIN IN and you will find it). Worst case, its in the repository in the Electronics/Test-Equipment/Various-Equipment folder. Good luck.
Ken
KB3MDT