I'm pretty much done with mods after all these years and don't regret any of them after all the iterations and testing. Most of the components are very heavily modified, especially the Sansui TU-717, and both the Counterpoint SA-220s which actually use a completely different circuit than the original amplifier. The first SA-20 became an NP-220 courtesy of Michael Elliott. It has Mullard brown base CV-569 ECC35s (6SL7s), CuTF V-Caps, and a 160,000 uF all-Black Gate power supply with boatloads of TX2575 resistors in all critical places. I loved the sound of this hybrid amp so much I added a second one that is almost identical. These amps are classics and the proverbial "open window" when it comes to transparency and tonal color. Not sure what I'd do if the 2 Counterpoint amps "died", but I came pretty close during Covid when replacement parts were really hard to source and Mr. Wu bailed me out (THANK YOU!). 

The system speakers are tri-amped Magnepan 3.6s and include Kinergetics subwoofer towers(5 10" woofers per side). One Counterpoint NP220 drives the tweets/mids, the other the 3.6r bass panels, and a recently added Krell Evolution S2250e drives the subs providing a deep and solid foundation. This system's flat to about 16 Hz.

The Pass Labs XVR-1-3 3way XO is incredibly flexible and has remained critical in sorting out this tri-amped system. I upgraded the only remaining passive tweeter-mid speaker XO in the 3.6s to something exotic - Duelund Cast caps and inductors instead of another XVR-1. The audio hobby wouldn't be where it is today without the many, many contributions of Nelson Pass.

All the system cabling is supported by Cable Elevators - I tried using the empty champagne bottles but the system didn't quite sound as good -- burrrpppp. Hasn't stopped me from loving the fizz.

The room had a makeover with acoustic treatment. It's 13.5 x 27' and is in the basement. An RPG pro diffusor sits behind the speakers with Real Traps & GIK Acoustics along the side walls & in corners. The back wall also has an RPG pro. The speakers have been moved away from the front wall so that second reflection arrival time is almost 10 milliseconds delayed from direct radiation at the listener location. This treatment work substantially improved the imaging, depth, and bass control. You just can't get good sound without paying serious attention to room acoustics.

I've long ago finished the final room EQ and balancing all the speaker outputs with REW. I don't use the DSPeaker Anti-mode 2.0 Dual Core processor except for an occasional adjustment of the sub outputs on certain recordings. 

Various AZ cables were added and all have been "cooked". The AZs ICs can compete with the higher priced competitors. Of course the SR Galileo ICs at 10X the price are noticeably better in most areas on direct comparison. I've verified this with the 7 cable shootout. The power cords are mostly LessLoss and Neotech. Upgrading the entire house's electrical system improved the sound way more than any cable substitution.

The system power outlets are all Hubbell hospital grade 20 amp jobs on their own lines.

A great recording is thrilling to listen to. There's lots of immediacy a trait which I value the most, wonderful tonal color, and the system has a terrific sound stage with solid center imaging. That last trait I found was the hardest to capture and was much improved by the addition of CMS footers. Overall balance is perfect, neither warm or bright, but with power and authority.

I listen to all kinds of music, classical, pop, jazz, world, etc. and this system is very musical. I'm spending lots of time listening to music, but cycling remains my number one pastime over these past 50 years.  Glad there's time for both!