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1. The negative feedback from the secondary of the output transformer to G2 of the 12SK7 reduces distortion.
2. Bypassing the cathode resistor of the output tube with an electrolytic can increase available volume, but introduce some distortion. SW chose not to do that in this case as they went for better overall sound using part 43 for negative feeback.
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Reece
Perfection is hard to reach with a screwdriver.
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