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Hi Sven,

My guess is that the transformers are made for being cheap. If made for microwave ovens they are only used intermittently at full power thus no problem. For continuous standby use they may be energy consumers if having too much resistance that dissipates the power as heat (active power) or Watts. If the power is pure reactive (VA-reactive) across only some few Ohms of resistance no problem too as very little heat dissipation takes place then. But it does look like some saturation is happening.

Regards
Ole
 

---In [email protected], <s.friedrich@...> wrote :

 Hello Ole,

the differences between the voltages are very different as far as the current consumption is concerned. Actually, one should assume that the transformers should actually behave fairly evenly, at least linearly, the current should increase with increasing voltage. What I particularly noticed is that a transformer is a bit louder than the other or just has a different pitch.

How to tune a transformer so!?! I could imagine that it is synonymous s.der core but there I have no influence on it.

regards

Sven