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In Reply to: RE: What tubes to use with this Interstage Transformers? posted by dave slagle on August 29, 2016 at 10:00:38
I don't know if your measurements are correct Dave.
I measured today a real output transformer (Audionote Se EI-core) and not a choke but i can't confirm your measurements. At least a factor 2 differance in induction. And because i can't measure with low signel levels wih this transformer i can't confirm my own statements at the moment. Damn!
Follow Ups:
can you please give me the measured results with and without DC current at two different levels of AC excitation.
For example... 1V and 100V at some frequency well below 1Khz (50-120hz) with no DC bias and then repeat the same two AC measurements with like 75% of the rated DC current in addition to the AC.
I have done this 1000 times or more and have yet to find a case where adding DC increases the permeability. The image below is a set of plots of inductance vs. current for a fixed AC excitation. As you can see that the addition of DC doesn't increase the measured inductance and if it did you would see the inductance increase as DC current is added.
dave
?
Edits: 08/30/16 08/30/16
For the plots I attached, the measurement setup is a Genrad 1633 setup sitting 10 feet behind me.
dave
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