The correct internal-inductance of Windfeld cart.?


What (on earth) is the correct internal-inductance of the Ortofon Peer Windfeld cartridge?

They made a mistake in the brochure about the loading impedance: it says >10k but should read >10 ohms. This was admitted by the factory's techies.

The brochure also says internal-inductance: 700 mH !!!
This you would expect from an MM cart. Was this also a factor 1 000 error? I can not find ANY help on the web to clear this up. Can any one help?
axelwahl
I admit I haven't read through all of these posts, so I am not clear as to the controversy here, but, I don't get the concept of "20 time the voltage for free." The cartridge's output is fixed -- it is a certain amount of mv per the particular modulation supplied by the record groove. As a low impedance source, it is delivering this output as, relatively speaking, a high current, low voltage signal. What phono stages do is amplify/convert the signal to a high voltage/low current signal. An input SUT converts the high current/low voltage signal to a low current/high voltage signal -- nothing is "free." A loading resistor of any value across the primary acts as a voltage divider which will dissipate some of the signal as heat (i.e., a loss). Of course, the higher values used means that little is lost. The voltage gain (at the expense of current) is determined by the turn ratio of the SUT, I don't see how it has anything to do with loading.

My phono stage has a loading resistor across the primary. The recommendation by the distributor of the phonostage is to experiment with the value of this resistor to optimally load the chosen cartridge. The distributor does not recommend changing the value of the resistor on the secondary side. This makes sense to me. That resistor provides the optimal loading of the SUT itself (these things will have their own electrical resonance properties).
Any one around this place that understands what is a generator, or how it works? Help!

Switch your car light on and the dashboard lights dim?
No need for a regulator either...

A cart going into a lower than usual impedance will output more current, NOT Voltage yes. But instead of frying the current through a resistor, you pass it through a transformer coil and as a result get that current (in the relevant ratio) transformed into Voltage on the secondary.

I find it absolutely staggering that this seems such a unbelievable concept to grasp. We are not in the 1800s, or?

I think I'm done here, and thatÂ’s just fine too. Nobody is using an SUT, and everybody KNOWS why it can't work, truly amasing that is.

Let's agree to close this thread, not value added this.
Axel
Dear Axel, Intactaudio is a professional in the use of transformers, autoformers, chokes, etc, in audio. He is highly respected on other internet forums for his knowledge and unbiased advice. Rather than leaving in a huff, you might be better served by considering that what he has written in response to your posts is most likely correct. Then you can learn something new, which is what we are all here for. No one, including Dave, is saying that your particular choice of a topology for your cartridge and your SUT does not sound excellent.
Hi Dave,
I just got that idea to check on your threads.
Now look here: "Thoughts on cartridge loading with a SUT" 11-22-08 !!

You appear to be quoting a couple of other originators quite liberally in your essay, hm.
OK, you are not selling a book here, but I try to figure out why you appear to give a hard time every step of the way, yet have all these superior insights as to be seen in your essay?

What points are your actually trying to score?!

If you are using an SUT already, why all this production of yours around here?!

And if you don't use one -- and you want to, why not ask some salient questions, instead of arguing over every weird detail?! Or is that just your idea of eduction?

You mention Van der Veen in your 'essay', - we use his trannie! While you talk about his 'Gorillas in the corner' using all his comic strip allusions... That's geeky, man!

Are you just trying to be extra clever and get a kick to make the rest look like fools?

I truely start having my doubts about your sincerity, and I wish I am wrong.
I like to help, and you seem to enjoy some geeky game instead.
Maybe - what we have here, is failure to communicate...

Axel
Lew, AFAIK Dave Slagle of Intact Audio is a transformer manufacturer. He isn't merely a user or repackager of transformers made by other companies, but designs and winds his own transformers, including AFAIR, MC step-up transformers.

regards