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Attached?
Even with $100 shipping, this should be a good deal for an amorphous core OPT. All orders have to be shipped, unless you have a shop round the corner which is highly unlikely!
Looks quite good, but the measurement should be better documented to draw conclusions:
- what is the source impedance of the measurement set up?
- apparently there is no DC current applied through the primary;
- I don't see the secondary loaded with a lowish (loudspeaker) impedance.
So the measurement seems to be a bit unlike the situation in an amplifier circuit.
Square waves?
- what is the source impedance of the measurement set up?
- apparently there is no DC current applied through the primary;
- I don't see the secondary loaded with a lowish (loudspeaker) impedance.
So the measurement seems to be a bit unlike the situation in an amplifier circuit.
Square waves?
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Rajko,
Nowhere...
Static measurements (I reckon frequency sweeps without DC current and unloaded secondary among them) can be useful and, applied well, give a good indication of how a transformer performs in the dynamic condition of the amplifier - loudspeaker interface.
For critical applications I set up a breadboard amplifier to do measurements with all requirements applied. As most of my transformers are (were) custom made, the requirements are always different, and publishing measurement results make more sense when it is about standard transformers with fixed parameters.
The transformer tested in the you tube video might, and likely will, be a good transformer (and a steal for the money...); however the measurement set up as in the video is not sufficient.
Nowhere...
Static measurements (I reckon frequency sweeps without DC current and unloaded secondary among them) can be useful and, applied well, give a good indication of how a transformer performs in the dynamic condition of the amplifier - loudspeaker interface.
For critical applications I set up a breadboard amplifier to do measurements with all requirements applied. As most of my transformers are (were) custom made, the requirements are always different, and publishing measurement results make more sense when it is about standard transformers with fixed parameters.
The transformer tested in the you tube video might, and likely will, be a good transformer (and a steal for the money...); however the measurement set up as in the video is not sufficient.
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I can only say my 3.2K SE OPT sounds very nice - I don't have the tools to measure it, but I don't think anyone should be afraid or trying a pair. I do appreciate that measurements would give added information.
Here's a pic of the workshop. Very friendly and helpful guy.
Here's a pic of the workshop. Very friendly and helpful guy.
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We could do with some younger audio transformer winders! The good ones from Tango, O'Netics and so on are retiring or retired.
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