please explane the working principle of magnetic amplifire

 

Here it is lazy bone

 

Hello,

The magnetic amplifier is an old technique.
This book will give you some details:
http://www.pmillett.com/Books/mag_amp.pdf

Bertus

 

Looks like one of my works of art:

http://www.pmillett.com/images/classa2_big.jpg

Only difference being the plate would be cherry red on mine