abbey road d enfer said:DC magnetization is caused by different turn number, not DC resistance differences. It is perfectly normal for windings to have slightly different DCR even when the turn number is the same. Different average diameter.
However, it may result in some differential DC voltage, which the xfmr in the mic may not like.
?????
Sorry Abbey, maybe I wasn't clear.
I'll try again...
Suppose the HQ UTC transformer has a turn number exactly equal in both halves.
Both halves have a different DC resistance. By phantom over the center tap the DC current drawn by the microphone will not be the same on both sides.
Nor the DC loss over the winding, nor the current drawn is equal on both sides. Cancellation will not be perfect. This is causing magnetization. (Very very very little as proven by my measures.)
'However, it may result in some differential DC voltage'
Different DC resistance causing differential DC voltage= DC over the primary=magnetization.
Different DC resistance in both windings is causing (very little) magnetization.
some differential DC voltage, which the xfmr in the mic may not like.
= because also this xfmr will suffer (very very little) from magnetization...
Of course, this is all sooooooooooo ridiculously minimal, as shown in my previous post...
Paul
[Edit:]
Sorry again Abbey, now I see...
You probably meant to say:
"Values are so low that magnetization caused by DC resistance differences is neglectable, quasi non-existent..."
I didn't get it!