SPL Lundahl Transformer (OUT) Balanced Output Transformer for 1 Channel

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Product Code: 9136

Description

SPL Lundahl Transformer (OUT) Details
LL1539 is an audio output transformer for balanced drive. In LL1539, the winding arrangement is such that (properly connected) the secondary windings are surrounded by cold (neutral) parts of the primary windings. This reduces the effect of the capacitance between the primary and the secondary windings. Thus, primaries should always be connected as in the application example below, with or without current feedback drive (negative source impedance).

A good part of the "warmth" that is commonly associated with vintage gear comes from transformers. With transformers the low end and lower mids sound rounder, full-bodied with more punch. The top end gets a silky touch and benefits from improved presence without sounding boosted.

Reasons are reduced odd harmonics (which produce harsh top end impressions) and a slower characteristic compared to electronic stages which causes a more voluminous sound. We recommend transformers especially for vocals while electronic stages can be better for highest precision in signal transmission (transients), but in the end it's a question of personal taste, which mics are in use and so on.

Used in SPL preamps or channel strips, the input transformers add ca. 14dB (depending on the microphone) of gain. This must be added to the scaled values. The additional passive gain relieves the complete unit permanently at any gain level.

That's why the input transformer is more important in preamps, but to benefit from all possible sonic effects and full operational safety, both input and output should be equipped with transformers. If SPL preamps only offer an input transformer option, the simple reason is not enough space.

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