I'm sure 50%+ quality of a tube amp is determined by the components, 30% by building and 20% by design. We built a 6L6 SE for testing purpose with new transformers and components. Testing with HP3563A and Audio Precision instrument, the result is pretty nice. There's nothing special with the circuit, same as the cheap 6P3P kit. But the components are totally different. See attached pictures.
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