Why are some Lundahl transformers available with different current values (mA values)?

Lundahl uses this to optimize its transformers for the specified nominal current (bias). At this current, the core is still far from saturation, providing more headroom. The number of windings and the air gap are optimized so that ohmic losses, leakage inductance and winding capacitance remain low, while the primary inductance is as high as possible for the available construction size. All of this together guarantees optimized bandwidth, low distortion and lower transformer losses than with conventional output transformers.

If you are planning a small series, you can also specify your desired nominal current at BTB if it is not already available, and we will offer you the matching Lundahl transformer.

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Of course, Lundahl transformers can also be operated with a lower current than the specified value.