Ok. Initial test does show secondary voltage increase as I add primaries in series successively from 1 to 5

so the audio amp had input of 1khz and set at 20vpp

through the 6.2ohm ballast resistor im just showing the primary pp voltages vs secondary voltage. Secondary is bifi in parallel at .5ohm. Wish I still had the number of turns but I believe the number of sec is less than any primary, so the single primary voltage vs the sec voltage should reflect that ratio. The wire for each turn of the secondary is a bit longer than a single primary turn. Maybe 3 to 4 turns of primary to one turn of sec wire length. The 2 bifi windings in parallel will make for half as many sec turns..

1 primary 11.2vpp secondary 2.6v

2 primary series 14.4vpp( 7.2vpp per series primary) secondary 3.4vpp

3 primary series 16vpp( 5.3vpp per series primary) secondary 3.72vpp

4 primary series 16.8vpp( 4.2vpp per series primary) secondary 3.84vpp

5 primary series 17.6vpp( 3.52vpp per series primary) secondary 4vpp

Didnt have time tonight to go through and adjust for similar input voltage to the primaries. Will need to chart the ballast resister voltage also. So far 1 primary at .7ohms with a 6.2 ohm resistor in series, the primary voltage doesnt make sense. May need to change freq. Will do more to work this out. this was just an intial voltage test. Also I will find what the sec bifi resonance is and pick a freq to avoid that so I can run the sec in series instead of parallel.

looking at the numbers now while at home to write this, it looks like if the primary voltage remains the same, like say 16vpp, for 1 or even 5 primaries in series, the sec voltage just may remain at or near 3.72vpp as shown above, like I had anticipated in my earlier post. For me, that is awesome. If further testing shows that as we add more series primaries and the sec can still drive a similar load, then this is what I have hoped. As we add more primaries, the input power will decrease while the sec output remains the same. Hopefully. There has to be a point of where we can breach 100% eff as we double the number of primaries. Similar to doubling speaker driver numbers.

As I get experienced with this I am already coming up with what goes into the next build with more cores and primaries. Im thinking that it should be safe to say that just powering a single primary, that the turns ratio with the sec should be standard.

Ok more in the coming days. Need to hope for similar or better sec power output as primaries are added in series. If so, then this WILL be the building block toward true OU.

Each doubling of series primaries decreases input current by half.

Mags