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Old 9th March 2011, 08:25 PM   #10891
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Sorry about the typos. want instead of what, and instead of in, it is difficult for me to fix these typos, given that I a under continuous moderation. Sometimes, like now, it gets embarrassing.
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Old 9th March 2011, 08:27 PM   #10892
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Quote:
Originally Posted by jneutron View Post
Why is 3 henries "leaky"? I must have missed something..

What about 680 henries?

Cheers, John
That was a jab at Steves idea that ideal transformers
have no inductance except leakage.
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Old 9th March 2011, 08:31 PM   #10893
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NOTHING is ideal, that is why we need intelligent engineers to see the weaknesses and work around them.
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Old 9th March 2011, 08:42 PM   #10894
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Quote:
Originally Posted by john curl View Post
JN, what does this have to do about the discussion in hand?
Please try to follow the discussion John.

3 henries was "leaky". So I asked, what was that in reference to, as I missed that from earlier in the thread.

The 680 henry magnet I'm working with must be considered "open floodgates" then.

You really should have asked about the Ls-Rs model, and how an HP 4284A classes eddy losses as a series resistance within the wire, in addition to the reduction of inductance caused by the eddies..

This implies that any current within the wire not only generates noise within the wire, but the slew rate of the current will cause the eddy currents to generate noise as well. A first derivative based amplitude modulation of a noise source..

I wonder how that would show up on a spectrum analyzer..

Cheers, John

Last edited by jneutron; 9th March 2011 at 08:52 PM.
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Old 9th March 2011, 08:42 PM   #10895
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Negating 'idealness' for a moment,
isn't it a fact that the mutual ' inductance '
of the coils of a transformer is the basis
of its operation ?
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Old 9th March 2011, 08:49 PM   #10896
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Quote:
Originally Posted by john curl View Post
Now, what IF you made a transformer of essentially the same material in the same way? After all, a transformer is made of 2 coils, the secondary usually being very much like the 1H head. Could there be a similarity in behavior? I should think so, and I measured it, long ago.
What was it you were saying about apples and oranges earlier?

se
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Old 9th March 2011, 08:51 PM   #10897
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I read the VdV paper to suggest that when the source impedance is > to >> than the primary impedance (reflected from secondary), a potential high-pass-filter is created that weakens the midbass at threshold levels. However, when the source impedance is less than 1/2 the impedance seen on the primary, these effects are minimal. So I'm not clear how this might even apply to MC transformers. I like this kind of study, as it tries to find a reasonable explanation of the increased detail percieved from triodes when compared to pentodes used as output devices (taking the preference as a *given*.)

Last edited by thune; 9th March 2011 at 08:56 PM.
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Old 9th March 2011, 08:52 PM   #10898
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Quote:
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3 Henries ...... That's a leaky one alright.
And 64 Ohms leaked up to 600 Ohms ...
No no, the 3 Henries is primary inductance, not leakage inductance.

se
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Old 9th March 2011, 08:54 PM   #10899
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Quote:
Originally Posted by Steve Eddy View Post
No no, the 3 Henries is primary inductance, not leakage inductance.

se
sheesh...I wish my inductance was primary..the 5 gauss line is over 20 feet away.

John
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Old 9th March 2011, 08:56 PM   #10900
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Quote:
Originally Posted by hitsware View Post
That was a jab at Steves idea that ideal transformers
have no inductance except leakage.
Ideal transformers don't even have leakage inductance.

C'mon, Mike. Surely you know what "ideal" means in this context.

se
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