Discovering that a budget-friendly or beat-up amplifier actually contains high-quality, "holy grail" output transformers (like those made by Mercury Magnetics or vintage Partridge units). These components are responsible for the rich, warm harmonic distortion that modern digital modeling struggles to replicate.
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Many vintage tube amps were modified in the 70s and 80s. A technician might open a chassis expecting a stock circuit only to find a "surprise" custom-wound transformer that completely changes the gain structure of the unit. 2. Historical Context in Media tube tranny surprise