Valve Audio Devices DAC-10 User Manual - page 4
4
Power supply:
Power supplies are independent for digital and analogue and Left and Right channels. All
power supplies are inductor (choke), loaded, series resistor-‐less and bespoke designed.
The current generation of DAC-‐10 DSD has 18 power supplies working with five mains
transformers.
Vacuum tube analogue output stage:
The DAC-‐10 / DAC-‐10 DSD vacuum tube triode analogue output stage is point to point
engineered to operate as:
1.
PCM stage differential audio signal coupling (transformer-‐less).
2.
DSD stage audio signal coupling.
3.
Gain control -‐ part of this function implemented in DC mode.
4.
Signal dependent variable tube biasing (automatic).
5.
Signal amplification.
6.
SE and balanced out signal stage.
The whole tube circuit is operating in pure Class A.
Selected-‐by-‐VAD audio signal capacitors are hand wound waxed ALU foil paper in oil in parallel
with silver mica and copper foil in Teflon to create our unique combination of one per
output/channel.
Casing:
The unique VAD casing is designed as a monocoque structure with the fulfilled aim for
extremely high mechanical rigidity, EMI and RFI screening and vibration damping.
It is polymer coated and additionally polyurethane `silenced`.
The only structural parts fitted with screws are the aluminium top cover and valve cover.
Electrically the casing is directly fully grounded via the safety earth pin in fused IEC socket.
Direct grounding provides the highest electrical safety and also means that the EMI/RFI screen
really is a `screen`, not just a piece of metal in the way of interferences.