Can you give us information or a link concerning such PCM R2R implementation?
Look here for example: http://lampizator.eu/Fikus/DAC_ATLANTIC.html
The Golden gate and Big7 are the same. I also says it on the Dac spec spped that ships out with each one. Amber and Euforia are not R2R ladder.
The Golden versions of Atlantic and Big7 have these premium parts upgrades:
1.Silver WBT solder used throughout
2.All wiring is 26 GA stranded silver in teflon
3.WBT gold / silver RCA output sockets or Furutech Rhodium RCA
4.Furutech RCA digital S/PDIF input or WBT
5.ATOM Vishay first capacitor after the tube
6.Mundorf M-Lytic HV electrolytes in second stage of PSU Or Kendeil
7.Mundorf Foil MKP capacitors or Clarity Cap iPX series in third, final stage of power supply just before the tube anode.
8.Metal-Film laser cut resistor MLT in Anode Load
9.CMC Teflon sockets with gold pin contacts for all 3 tubes
10.Output capacitors are the huge Jupiter-Copper 1uF caps or Audyn True Copper 1 uF, bypassed by Duelund Pure Silver caps or by Mundorf Silver Oil Supreme. Yes, a hybrid, best of both worlds, supposedly beating even pure silver one-cap solution.
11.Rectifier tube is Emission Labs monstrous Mesh Plate 5U4G or EML Mesh 274B
12.Music Tubes are Western Electric Replica 101D / Metal base Psvane or MESH45 EML or KRON KR PX-4 or KRON KR-300B
13.Digital input SPDIF capacitor is Jupiter Wax Copper 100nF or Mundorf Silver Oil Supreme .
14.Packing in a special customized stage case made to order for Golden Gate DAC
15.Chassis / box is made of pure copper stamped and powder clear-coated for 100 years of immaculate shine. Copper provides also heat dissipation and the best EM shielding possible.
16. A set of ceramic / steel roller-block feet supports the DAC
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