CARAT Ruby Mark II DAC and Headphone Amplifier. 

It has been rare in the UK, Korean made. No UK dealers.
It is a very highly speced product that sounds amazing!

RUBY2  has USB input as well as Optical digital input. RUBY2 can be connected with DVD player or normal grade CD player and produce fantastic audio quality. 
For digital chipset combination, RUBY2 was designed with PCM1796, Burr Brown and CS8416, Cirrus Logic.
For the OPAMP part of analog output, the following are used: OPA604, Texan Instruments and OPA2134, Burr Brown.
In total six output OPAMPs are utilised in HEXAD configuration where three work for left channel and three for right channel in isolated dual mono configuration.
As with the previous model of Ruby, Ruby Mk2 has got audio parts from SANYO OSCON, WIMA, VISHAY DALE, TDK, etc.
Full aluminum case, aluminum volume knob and 24K gold-coating PCB, TCXO 1ppm, Toshiba’s optical terminal.

Specs
    1. Main DAC : Burr Brown PCM1796
    - 24 bit 192Khz sampling advanced segment audio stereo DAC
    - Dynamic range : 123dB / THD+N : 0.0005%
    - 8x Oversampling Digital filter
    2. Digital Controller : Cirrus Logic CS8416
    - 32Khz to 192Khz sample frequency range
    - Low Jitter clock recovery
    3. USB controller : TE7022L
    - USB2.0 FS DAC / Fully compliant with USB1.1 specification
    - Input : 32Khz / 16Bit ~ 96Khz/24Bit
    4. OPAMP : Total 8pcs (DIP type)
    - Output : Texas Instruments OPA604 x 2pcs
    - I/V : Texas Instruments NE5534 x 4pcs
    - Headphone : Burr-Brown OPA2134 x 2pcs