Hi Peter,

thanks for the encouragement, It's actually two 4-strand multicoils, and I'm planning on expanding up to 10 multicoils. The first one has 5 strands because of the trigger. I have 3 transisitors on each coil, the fourth wire was initially planned for cap pulsing recovery, but I got more out of it with an output diode. Even on a single setup I noticed that output diode charges faster. I don't know why. Do you? Also what is the advantage of a fwbr vs single diode? The pulses are positive anyway no?

About the diode recoveries, I put ammeters on input and output, and for each setup I tuned the pot for the same input current to see wich one would give the most benefit on the output. With one transistor working I added one recovery and could see a distinct benefit, nr two added a bit less and nr 3 very little. Then I tried two transistors, the first recoveries added less vs the single setup. Comparing all the setups, firing all three transistors with no recovery seemed to be what gave the best output vs input curent. Maybe just adding transistors is still best, but I have to repeat this test with switches instead of soldering and de-soldering so many times.
I know ammeters don't measure the radiant part but the byproduct, so do you think the way I measured this is ok?

best regards

Mario