Hi Karin: First and foremost--- it is NECESSARY that you hook-up the transformer the proper way. It is not an option, not something that would be nice to do... this transformer will NOT work properly the way you have it hooked up.
The ill-gotten behaviour that you're getting--- which we too have gotten on the test bench when you hook up either side of this transformer improperly---
A great customer from Italy of ours bought a pair of transformers which were also bifilar wound--- inadvertently he had hooked up the primary on one unit the wrong way--- he wrote to me and was alarmed that the distortion was unmistakbly much larger on the one transformer than the other one--- and it was in the midband and higher frequencies where the behaviour was so bad.... the fix was simple... once he unsoldered the pri leads on the offending trans and hooked them up the right way... his troubles were gone.
But the fix is simple--- hook this transformer up the proper way.
RED on the primary MUST go to ground.
Black on the secondary MUST go to ground.
If your not seeing or getting some real noticeable changes in the behaviour of this transformer when you switch the primary wires...
from being hooked up improperly to being hooked up properly... then I would be absolutely stumped.
MSL
Addendum: Please also note that operating this transformer is at a much greater risk of having a voltage breakdown from pri to sec windings when hooked up improperly. DO NOT OPERATE this transformer other than as prescribed.
Builder of MagneQuest™ & Peerless™ transformers since 1989
