The 606 MKII, also very useful information for the 707 and 909.
Remove the 8 screws on the bottom and the 4 screws from the rear panel. Remove the
bottom and the U shaped chassis part.
The unit will looks like this. Remove the amplifier boards with a long Philips (posidriv)
screwdriver; be careful not to make contact with the components on the boards. Remove
(loosen) the connectors on the boards with small pliers. Make notes, or pictures.