| 8 paralleled TDA1543 DAC chips DIR9001 96 kHz/24-Bit digital receiver TCD-711A Precision Clock USB , optical, coax inputs |
| power | Teradac DC-30W PSU |
| S/PDIF input | Lundahl LL1574 Pulse transformer wired direct to a /w 6N copper/Teflon to 110R nude Vishay resistor; removed input coupling caps, Optical/coax switch is now out of play |
| output resistor | (2) PRP 390R .5W |
| output caps | cryo'd Obbligato 1uF/630v + Mundorf Silver Oil .1uF/1200v + Russian Mil Teflon .015uF/200v - direct to RCAs, removed noise filter caps |
| digital circuit chips | Rubycon XYF 100uF/25v, blu tac |
| TDA1543 decoupling | 8 Rubycon XYF 4.7uF/50v |
| heat venting & damping | Arctic Silver 5 on DACs between heatsink, holes in chassis, heatsink on outside chassis, heatsink on DIR9001 & 23C32 amplifier, E-A-R feet raise chassis allowing better air flow into box, small E-A-R feet. |
| LED | 47.5k/.25W ohm resistor for dimming |
| RFI/EMI | Stillpoints ERS paper on clock |
| ground plane | Bud Purvine's Litz wire |
| cables | Blue Jean Cable's Belden 1694A coax SonicWave Glass TosLink @Partsexpress |
Bud Purvine's magic wire in cotton
removed over to the Chamelion
TeraDak DC-30W constant current source power supply
Replaced fuse /w HiFi tuning cryo'd
Detail on where the DC-30W wires up to.
The DC-30W PSU input connector. - Should say DC IN.
Copper pipe coupler on the IECs and ferrite on the incoming DC
 |
 |
| Lundahl LL1574 Pulse
transformer on coax input [datasheet] Using Belden threaded silver coax interconnect |
Lundahl LL1574 is a 1:1.2 [75-110ohm] which meets up to a 110 ohm nude Vishay. Transport is the NAD C541i which has a 75ohm output transformer. |
On my 2008 version there is a 100ohm smd resistor in the 75 ohm spot.
Yaqin Tube Buffer, VALAB/Teradac NOS DAC late 2008version, Teradac DC-30W PSU
NAD C541i CDP
Yaqin Tube Buffer
Replaced input caps /w copper wire; cryo'd 1uF/630v Obbligato bypass caps at output
2 Nichicon 270uF/250v PT; bypassed the B+ power cap with BlackGate STD 10uF/250v
Modding the Yaqin
| Some words on the web re the NOS DAC |
Shipping from Taiwan was fast, within a week.
Packing was down-home but was fine enough to protect the dac from harm.
VALAB
http://stores.ebay.com/Vintage-Audio-Lab_W0QQssPageNameZstrkQ3amefsQ3amesstQQtZkm