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In Reply to: RE: Is that a spike caused by collapse of the magnetic field as its switching? posted by walge on July 16, 2024 at 00:03:48
I consider distortion measurements on (output)transformers not very usefull.
The distortion depends highly on the source output impedance for for low signals it also depends on the core material.
You don't get any valuable information the way you measure.
Follow Ups:
Hi
In attach some test on three different trafo with different power
Backward mode
Walter
There is no schematic how you measured it, any resistors?
In attach the basic set up
The ss amp drive the secondary acting primary through a resistor, in this case 6 ohm
On primary acting seconday there is a load with a partitor to check the signal
Walter
Edits: 07/16/24
I guess that you know that the resistor is part of the distortion measurements, in other words, changing the 6 Ohm resistor value will change the thd.
This is not an industry standard measurement so for me it is pretty useless.
Edits: 07/17/24
If it is not compliant with the industry is not a problem
I will check in this way
Even the R could be part of dist measurement it is linear and not non linear as tube
Your choice of the resistor value makes the current distortion a lot bigger.
The current is also in the transformer so not liniair.Read Radiotron designers handbook for the theory (or Partridge).
And yes it's a problem if you presents results on an open forum like this. At home you can do what you like, no one cares.
You should place a warning that the results are not very usable because of a different "standard" (and read also wrong* standard).* no bias = wrong for thd and power measurements. Even frequency response could be different but that depends on the design.
Edits: 07/17/24 07/17/24
If it is not compliant with the industry is not a problem
I will check in this way
Even the R could be part of dist measurement it is linear and not non linear as tube
The problem is that your method is wrong. What you present has nothing to do in a real tube amplifier with a real tube with a different impedance,
When i look at the frequency plots of the 3 transformers you posted earlier i think they all look horrible. I didn't even know that Sowter makes so bad transformers... Is it broke?
You didn't use a bias current, also a big mistake, and i mean a big big big mistake speacially when you try to measure thd with your method.
At last, if you post measuruments from brands like Sowter and Hammond, don't use the brand name only, post the exact type, both brands make a lot of different transformers. Is the thirth brand some local brand?
It seems that you are the same person banned 5 times in DIY forum
The method is always the same
And, as always, you haven't any fact to show us, only words.
I hope the administrator will read this post
Walter
Walter, your method is always the same, you present your methods as being the Truth, but without any scientific evidence. As with other topics on other forums, you simply ignore scientific articles by Patridge, one of the great legends in transformer technology, simply because you want to tell your own story. What a shame.
And now you're complaining about what? Because my knowledge is better than yours? Please don't be so childish.btw, you have to explaine the Sowter transformer too because Sowter has no information on there site which explains this kind of measurements. I think you are a liar.
Edits: 07/16/24 07/16/24
Don't worry
Be Happy
Walter
thank you Walter, the same for you. Please next time good arguments based on good and profen theory
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