Already rolled output and preamp tubes to Skunkie recommended. Significant upgrade! I want to explore the PS caps, headphone jack , and direct speaker ground. Is there a simple list out there ? I've watched the videos, but, alas, I have "OLD".... Yeah - I'm old and forget stuff Source is Eversolo DMP-A8, speakers are the Klipsch Cornwall IV - so triode mode is more than enough! Rattles the house!