Evidentially it was offered in a factory wired form or kit form. I would like to find/buy the kit instructions and or schematic for this unit. I can't seem to find a schematic or any information other than it was made in 1950 was offered wired for $48 and in kit form for $22. Its quite nice for its age and with some rewiring and tweeking the 4 pots I would be able to bring it back to its former glory or at least good enough so I can use it on circuits in old radios and such. Any help would be appreciated. More than willing to buy the information that I need.