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This is a solid and great sounding AMP. I think I will live very long time with it. But it needs back tube replacement. Front tube is OK (even great, detailed tube after burn-in). But default Chinese back tube makes sound muddy. If you purchase a RCA JAN (military) and especially SAC (Strategic Air Command) 6AS7G tube from 1950's, it becomes a great AMP. Also DV336SE needs at least 200h of burn-in. There are many posts regarding the tube rolling and Fitz-Mod on head-fi forum site. Long live 336!