Toslink receiver supply supply bypassed with the 220uF tantalum capacitorĪll those mods were thoroughly tested. digital voltage supplies of the CS8416 SPDIF receiver and the CS4397 DAC chip bypassed with the Sanyo WG capacitors (better specs and sound than OSCON) all supply voltages of the analog section of the DAC bypassed with the Elna Silmic II capacitors shortened ground traces for the op-amp slot Elna Tonerex capacitors on each voltage rail on the DAC PCB 20VA 2x 14V AC toroidal transformer in place of the original one (hum with OPA-Moon showed it's too weak) So, here is the short list of upgrades making this DAC a reliable, I hope, test platform: At least it could fight with: AudioNemesis DC-1 upgrade+Tara Labs internal wiring, the NorthStar M192 MkI or theTheta DSP Gen Va. However, after some mods, this DAC kit starts to compete or maybe win (last upgrades haven't been verified yet) with $1000-$3000 DACs. I'll just admit that the stock form of this kit will not catapult you in the hi-end sound realm, it's rather significant upgrade to budgetary CD players and comparable to devices like 2x OPA627 upgraded Zero DAC, based on my forum mate's opinion. What hi did to this DAC, you can read here: CD DAC Lampucera lampizator This DAC has been “discovered” and popularized mostly by Lukasz Fikus. I bought the kit from gigawork on ebay, choosing the SMD version which some people consider as the better choice because of short traces and separated power supply built on another printed circuit board. There were other strictly analog part related mods like capacitors and op-amps replacements which improved the Technics' sound significantly but it still was not the class of the modified. precise 5ppm gold pin OMIG quartz put in the SOAD70A mechanism servo circuit long and thin PCB traces doubled with solid tin-plated copper wire Elna and Sanyo capacitors replaced in many sections of digital and analog power supply ultra fast MUR120 diodes in place of 1N4003 rectifying diodes (8 pieces)
This one has been modified heavily but I used it as the digital transport only.
For the purpose of the fellow who sent these discrete op-amps to me and chose his favorite using these headphones and the Zero DAC, IIRC.
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