Tube DAC with output transformer

Inputs: Switches Coaxial, Optical, USB
Output: RCA, 3.5V (RMS), 80 Ohm
SPDIF receiver chip  (Coaxial and Optical) - CS8414
USB receiver chip  - PCM2704
IC DAC - TDA1543
Current-voltage converter - vintage resistors Siemens
Tube: 2 pcs. matched NOS 6S3P-DR gold grid gold pins
The output transformers wound on cores of vintage Telefunken
Operating frequency band: 10 Hz - 20 kHz
Total harmonic distortion <0.1%
AC Power: 230V or 115V
Dimensions: width 24cm, height 10cm, depth 27cm,
Weight 4 kg