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Output transformerless (OTL) is a term which describes a subset of vacuum tube audio power amplifier topologies, all of which omit an output transformer for the purpose of greater linearity and fidelity. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifier's output stage to the loudspeaker. Instead, OTLs use one of two primary methods for output stage coupling: direct coupling (DC) or capacitive coupling (AC). == Additional definitions == There is some contention with respect to applying the broader term "OTL" to capacitively coupled designs and variants. The need to delineate these designs from their directly coupled counterparts has led to the informal adoption of several additional terms, including: * OCL (output capacitorless) - which distinguishes OTL designs lacking an output coupling capacitor (directly coupled) * DC-OTL - which denotes a directly coupled design; synonymous with OCL * AC-OTL - which denotes an AC (capacitively) coupled design * Z-OTL - which denotes a small class of variants 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Output transformerless」の詳細全文を読む スポンサード リンク
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