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In the Forum: Melquiades Amplifier
In the Thread: An ultimate transformer for narrow bandwidth?
Post Subject: Re: An ultimate transformer within a narrow bandwidth?Posted by cv on: 2/16/2005
Allo
T wrote: "Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakage inductance a problem that is increasingly hard to solve as size increases (though I believe S&B has a solution to that problem now)."
Fairly sure it was a typo, but the bigger the airgap, the *lower* the inductance, all else being equal.
We need a large airgrap for a 6C33 due to the high current. The advantage is that the airgap linearises the BH characteristic of the core, so that it's perm is more constant (generally a function of level and frequency, particularly at LF).
If you confine the transformer to LF, you don't really care as much about parasitics (capacitance and leakage inductance) as these are things that affect the top end.
T's next point above >100 Hz was spot-on in my book.
cheers
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