I received the following from Egon about 10 days ago and the board version are as follows:
Controller - PCB 10 Ver 4 11/2013
Amplifier (Ferrite) - PCB 12 Ver 3c 8/2013
Amplifier (Efield) - PCB 13 Ver 1b 4/2013
Amplifier (Efield) - PCB 14 Ver 1b 4/2014
The PCB 13 Efield amp is very similar to the PCB 12, so most of the instructions for this would be the same.
Hope it's of some help.