First step was obvious. I had been looking at that Oppo linear power supply on the OPPOMOD website for a while now, but always thought that it was lower down on the priority list. Well, obviously, it just rose up to priority #1, lol. So, I pulled the trigger and ordered it.
The OPPOMOD LPS came. I ordered the “SE” version (though it looks like that the non-SE version is no longer being offered for the older players, no big deal, the SE is better). I am quite impressed with this power supply. Nichicon KW capacitors throughout! A whopping 60,000uf just for the 5V regulated output!!! (for digital). Upgraded schottkey diodes. It looks like the post-regulator caps are WIMA MKP and the tantalum to really stabilize the voltage. I don’t think this needs post-regulator electrolytic caps because the digital board already has these as power supply filters. This thing is HEAVY! The build quality is absolutely excellent.
First thing to go is the stock AMR fuse he puts in. I placed in a 2A Hi-Fi Tuning Supreme fuse I had sitting around. I figured, it’s a digital transport and silver digital cables are best, so let’s use silver for power supply fuse as well. In addition to the LPS, I also upgraded the internal 15-pin power connector between the LPS and digital board – using the 22awg upgraded cable found on ebay listed as “Tweak OPPO BDP 93EU 103EU 103D 103US 103AU nappe d'alimentation optimisée”. I applied dynamat to the top of the disc drive, the top of the case/cover (where it didn’t impede the LPS transformer) and to sections of the bottom of the Oppo chassis. These things were just tweaks and wouldn’t hurt, but the main upgrade was the LPS.
So, initial findings. The LPS does get hot! The LPS has a thick metal L-bracket that thermally connects the voltage regulators to the bottom of the Oppo chassis (for heat). I found that the bottom of the case gets really hot after a few hours. I did notice that after a few days of burn-in, it did not get quite as hot. I think the regulators became more efficient during burn-in. I don’t think this heat is a big concern for the 103, as my Krell processor also warms up. The rest of the Oppo case is only mildly warm, so I think the case does a good job as a heatsink. The digital board definitely uses a lot of current! It’s almost like a Class A analog circuit!So, I did notice a good improvement of video quality from the Oppo. It is apparent that the stock switching power supply was introducing noise into the picture. Images were much sharper and cleaner than before. Surprisingly, the audio had a distinct jump in sound quality as well. Everything was more solid and, man, the bass was so strong and hit hard! So, even though it’s “just a digital transport”, the linear power supply matters a great deal!