Marantz 2250B Sparkos Labs BA312-M Upgrade! Great Results! (plus phono preamp rebuild, cleaning)

What tools do I use? https://youtu.be/MLK649c1_fM 0:00 - Introduction 0:41 - Disassembly 2:28 - Sparkos Labs BA312-M Unboxing 4:48 - Installation 8:16 - Further Restoration of PE01 Preamp Board 11:06 - Cleaning of Controls with DeoxIT 15:10 - Restoration of P400 Phono Preamp Board 17:49 - Time for a test! Did I make any mistakes? 19:12 - RightMark Audio Analysis of Preamplifier 24:42 - Conclusion Perform all work at your own risk. I am not responsible for any injury or damage. Link to Sparkos Labs discrete op amp explanation: https://www.youtube.com/watch?v=cdYFH9ms9EE Link to Sparkos Labs BA312-M: https://sparkoslabs.com/product/ba312-m/