Myles,
Which version is it?
Do you know how to tell?
The very first ones had two motors. A main motor to drive the platter, & a 'donkey motor' intended to start up the main one in the right direction. If you remove the platter, you can see the smaller drive pulley offset from the main one, connected by a belt.
The most obvious differences between later versions were mainly in the plinth.
The originals had beautiful
solid American walnut. From there, it went to ply with walnut veneer - chipboard with walnut veneer - chipboard with vinyl veneer.
Under the bonnet, the older ones had substantial webbing running up and down the 'wings' of the sub-chassis.
http://img15.imageshack.us/img15/3710/aradvert.jpg