If you want to compare audio transformers primary inductance , saturation current for SE , leakage inductance , capacity between windings , core quality and of course usable loads are important .
Frequency tests must be influenced by this parameters ... in a real tube amplifier , I doubt you can simulate this so easily with solid state ( generator output ) .
If you are serious about testing you can build an "universal" output stage with tubes
Frequency tests must be influenced by this parameters ... in a real tube amplifier , I doubt you can simulate this so easily with solid state ( generator output ) .
If you are serious about testing you can build an "universal" output stage with tubes
Hi
I have repeat that the goal is to have a complete range of results that can explain the qualty of the trafo itself outside the amp stage.
The Freq. answer is one of the parameter, maybe less important than THD vs Frequency.
This for different level of signals.
And it is not possible to have an universal tube amp because the Z out is stritcly related to the Rp of tubes and can't be almost Zero ohm as a ss can do ( of course, checked the ss amp for a good performances) .
And, probably, with more thd for different level.
Maybe I can reach a good swing as voltage.
Of course I can use more than a dozen of tube amp, well dimensioned for each trafo I want to test.
But the test results are the sum of two entity.
Conclusion: nobody here did see that you reached your goal. Secondly, not an easy test for SE and at last a waste of time.
Sure is not easy for you.
Unfortunately for you I reach the goal; but if you try to work better and hardly probably you will get some results.
Unfortunately for you I reach the goal; but if you try to work better and hardly probably you will get some results.
one additional note.
Regarding the dc current for s.e. the test show that the differences, mainly at low frequencies, between dc ( different level) and not dc are not so big.
This, of course, depends mainly form the nucleus and its quality and dimensions.
So it may possibly to have a good idea testing the trafo without dc.
Last time i checked i did not have 4900V powersupply. Almost nobody has…..
Btw, the Restistor value in this powersuppy is pretty low, between 50k and 80k (depending on current).
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The BH loop is totally different in a transformer with pre-magnetization. The maximum flux is can be more than twice as much without bias. So if you think it doesn't matter .... theory is not your best thing.
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Dear Sir,
if you read I specified that on proto of the test set is missing a power supply to drive the secondary.
It can't be possible to drive it with 4900 volt or not ?
It is evident
The new ones will be commercial and cost few euros; after the final test I can send the details if someone is interested
Right?
Every time I have to explain something to you
if you read I specified that on proto of the test set is missing a power supply to drive the secondary.
It can't be possible to drive it with 4900 volt or not ?
It is evident
The new ones will be commercial and cost few euros; after the final test I can send the details if someone is interested
Right?
Every time I have to explain something to you
don't worry, be happy
If you have some test reults that can show what you said, I will be happy.
What purpose again?
Timpert has already shown you that your frequency response is not in line with measurements using your forward method and also not in line when the transformer is used with a tube. The forward method is correct, frequently proven by many people.
Thd, a useless action....
Timpert has done a good job
And the results are confirmed.
And I have specified more th one time I consider the THD vs Freq. the main test that can say a lot
If you can' t understand is not my problem
Probably in the future with the help of someone you can finally see the light!
🙂
And the results are confirmed.
And I have specified more th one time I consider the THD vs Freq. the main test that can say a lot
If you can' t understand is not my problem
Probably in the future with the help of someone you can finally see the light!
🙂
Just take some lessons about theory, that helps you more.
“And I have specified more th one time I consider the THD vs Freq. the main test that can say a lot”
Just take some lessons about theory, that helps you more.
By the way , transformers like passive components don't have THD , an active stage driving a transformer has more or less THD depending on its parameters .
Re
Read carefully the link form Jensen I sent.
It is esplicative.
And the Thd is related to a type of iron AND signal level
Then search the 4 articles from Mr. Partridge around Trafo distortion.
The OT trafo is not linear as the tube output stage
Bye
Are you sure?
Read carefully the link form Jensen I sent.
It is esplicative.
And the Thd is related to a type of iron AND signal level
Then search the 4 articles from Mr. Partridge around Trafo distortion.
The OT trafo is not linear as the tube output stage
Bye
As you want.
In the Jensen paragraph there are all specification.
Then, when you will find the Mr. Partridge articles you will have other good information. They are form 1953 ( if I remember well) but lot of theory is written
Bye
Walter
In the Jensen paragraph there are all specification.
Then, when you will find the Mr. Partridge articles you will have other good information. They are form 1953 ( if I remember well) but lot of theory is written
Bye
Walter
OK , say here with your own words what is happening
So far nobody noticed that a transformer distorts at normal level in secondary , not in some kind of overloading
Than we all would be using parafeed output stages ( choke no transformer just the primary ) and so on , avoiding them... this brings another question , why would distort a transformer secondary and not a choke on the same iron ?
So far nobody noticed that a transformer distorts at normal level in secondary , not in some kind of overloading
Than we all would be using parafeed output stages ( choke no transformer just the primary ) and so on , avoiding them... this brings another question , why would distort a transformer secondary and not a choke on the same iron ?
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I haven't never speak about primary or secondary.
I show what happen in an OT trafo alone in the two way of test and the results are perfectly equal ( removing in the reverse mode the residual THD of ss amp)
As show on my diagram.
It is evident that to show the perfect results in the two mode the signal must be low due the limit of a generator that drives the OT in the standard mode; in my case the generator is one the best in the world because can delivery 20 Vrms with a wide range of Zout from 1 Hz to 260 kHz.
note: probably my english is not adequate.
I show what happen in an OT trafo alone in the two way of test and the results are perfectly equal ( removing in the reverse mode the residual THD of ss amp)
As show on my diagram.
It is evident that to show the perfect results in the two mode the signal must be low due the limit of a generator that drives the OT in the standard mode; in my case the generator is one the best in the world because can delivery 20 Vrms with a wide range of Zout from 1 Hz to 260 kHz.
note: probably my english is not adequate.