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Original Message

RE: Line output transformer

Posted by KevinC on November 26, 2016 at 10:13:05:

To quote the Lundahl website:

The primary impedance of a transformer in an application, as seen by the source, is the primary no load impedance in parallel with the transformed load. The "primary no load impedance" for a gapped tube amp transformer is the primary inductance. The "transformed load" is the secondary load as seen from the primary winding (Load * (turns ratio)*(turns ratio)). Thus, the transformer by itself does not have an impedance that can be used without a context.

The transformers that we have been exchanging posts about can be used with sources in the 3K-6K range, but the load reflected to the primary is a matter of the load impedance.

Historically, transformer manufacturers listed windings impedances that were in the middle of the range designed for. Lundahl does not do this.