Finally, I installed Amtrans AMCY Oil coupling caps with TU-8200. This is the joy of DIY. You can improve the sound at your discretion and budget.
If you have a bigger budget you can use Amtrans AMCA (copper foil $60 each ). I think the AMCY ($25 each) is good enough for TU-8200.
I will attend the SFO Audio show to spread out this JOY. You don't need big money to have excellent sound
Please trust your ear rather than reviews. DIY is my passion..