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transformers/output impedance

Hello,
I'm confused, or is it a question accepted that the use of output transformers for tube amplifiers, aims to lower the output impedance of the same, to match with the impedance of the speakers? However, how can a passive device (transformer) influence the output impedance of an active amplifier unit? I say that the output impedance is a characteristic of the amplifying machine, and transformers only optimize the ratio of its ability to deliver current, with the current requirements of the speaker, easily translated by its impedance
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charles1dad
10,250 posts
 
I agree with George's point in regard to output transformers. The really good ones can avoid the need for introducing NFB, if one choses to use easy to drive speakers. While I appreciate the sound reasoning and theory of eschewing the output transformer, the very best sounding tube amplifiers I've heard all utilize them! So definitely "art" plays a large role in designing audio components.
Charles,
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