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Re: PP Iron for SE - repost of a 1996 rec.audio.tubes by "Paul"....

This is why I have been looking for a reference on the effects of a DC bias on remanence. For the situation without the bias, it’s a simple concept, if a signal is suddenly removed, the core will return to the point in the hoop where H=0 and the value of B is where the loop crosses the B axis (Br), when we apply a dc bias (Bdc) do we have to shift the B axis for examining the remanence to the value of H=Bdc??

I'd think both B and H axes would have to shift.

We can look at the point Bdc as a magnetizing force, bur why can’t we also look at it as a demagnetizing force too? Doesn’t it have to work both ways. This makes the whole situation decidedly different than the case with no dc which has no external forces to deal with the remanence.

I don't see why it would have to work both ways. Again, I just see it as resulting in a shift in the loop is all with the same fundamental behavior.

There is a difference between hysteresis and remenance.

No, hysteresis and remnance aren't the same thing, but they're part and parcel of the same thing.

It has to do with applying a very small DC bias to MC stepups IIRC… I have never read about it, only heard rumors… and we all know how the audio rumor mill can work… I too would love to see a firm reference on this. (vry… ya reading??) the general thought was to allow the very small signals of the MC cartridge to operate at a point other than the 0,0 origin which was alleged to be non-linear. Given the tiny fluxes we are talking about, it is conceivable that the entire operation range could be occurring in the initial magnetization curve (ie very nonlinear part) of the core.

Thanks.

Though wouldn't the most non-linear point be the point at which it approaches saturation?

I find this all to be one huge puzzle that has to somehow fit together. Since the laws are already fixed, its fun to attempt to find the explanation that will connect what we hear with what we do, and this can hopefully lead us to even better results in the future.

There's certainly something to be said for that.

But it can have its drawbacks as well. Sometimes we get sent off down a particular path and end up ignoring other paths. While I like getting to the bottom of things, I do have rather more fun with a more scattershot approach. :)

se






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