[Techman]

As an additional observation that I forgot to add to the above post, the bit of wiring on the underside of the record deck mounting board looks like it has something to do with the supply and switching of the lid light when said lid is opened and closed. There's some sunk in metal strip work that looks like part of a home made switch. There's also some very strange goings on with channeled out wood for wiring with even one which seems to lead to a fixing screw hole. If I looked long and hard enough at the pictures, I could probably work out what was actually going on and how it was supposed to work, but I'll leave that to someone else if they want to take the time out to do it!

It's all very interesting - I bet the OP never imagined in his wildest dreams that such a story would unfold regarding this cabinet, which only has the lid light and its wiring and plug as the only bit of (original?) electrics left fitted.