The label should have the voltages of the various taps which should allow you to correlate the wire colours to the layout drawing (post a pic maybe?). If it doesn't you'll need to email Nik because, for future reference (ie future owners and repairers maybe 40 years down the line when this is a cherished antique!) you really do need these labels.

OK, so yours are a little different, but they are the same as mine so here goes.

345-0-345 are purple - brown -purple these go to the diodes on the powersupply rectifier board, the '0' goes to HT fuse.

0-120-220-240 are the incoming supply group. 0 goes to the neutral of you mains socket  and the wire matching your wall voltage goes to the mains switch, make the others safe and coil them out of the way.

3.15 - 0 - 3.15 are the heater supply, 0 to ground, 3.15's to the tag board and on to the heaters/filaments

6 - 0 this is the footswitch supply connect as per diagram to the footswitch voltage regulator board.

60 - 0 (OK yours says 50 but thats fine) this is the bias supply, connect the 50 to the board and the 0 to star ground.