From tnt-audio.com review
" There are balanced as well as single ended outputs. Actually I should say 'output stages' as both sets of outputs have their own complete set of output stages, with the single ended ones even equipped with a 6922 valve while the balanced outputs use opamps ".
Aldo, from Underwood HIFI
" The balanced output employs 4 x Burr Brown OPA-627 opamps, the best made. Tubes are two Electro Harmonix 6922s. "
How does that align with your narrative above - DAC chips vs tubes?
" There are balanced as well as single ended outputs. Actually I should say 'output stages' as both sets of outputs have their own complete set of output stages, with the single ended ones even equipped with a 6922 valve while the balanced outputs use opamps ".
Aldo, from Underwood HIFI
" The balanced output employs 4 x Burr Brown OPA-627 opamps, the best made. Tubes are two Electro Harmonix 6922s. "
How does that align with your narrative above - DAC chips vs tubes?