Protection networks - power supplies and other stuff not so interesting, but still needed.

You've read the section on how this came about ?  If not go back and do so !  Otherwise, take a look at the worlds first protection network that did not affect the sound AT ALL.  Yes - it is the first one !

The design is very simple, passive sensing of current, and then triggering a relay which removes the supply voltage from the output stage.  As you've probably know, the EC design uses one power supply for the voltage amplifying stages and one for the power output, where all the great currents go.  This seperation made this protection scheme work.  If not, big bangs would be heard .....

The power supply also needed some care.

However, we did not make it difficult.  The major issue here were the use of small capacitors instead of the sluggy big ones used by everybody else at that time.  We did understand that small capacitors in parallell were a better choice than sole big ones.  

The cabling were another issue, look here later.