<p>Vacuum tube amplifiers traditionally sport twin square transformers on their frames while solid state amps seem to have only single round toroids for their operation. Why is that?</p>

Vacuum tube amplifiers traditionally sport twin square transformers on their frames while solid state amps seem to have only single round toroids for their operation. Why is that?

Why do tube amps use square transformers?

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Why do tube amps use square transformers?

Why do tube amps use square transformers?