Behringer Ultramatch Pro SRC2496 adding tube buffer

Professional-wannabe Sample Rate Converter, inner ADC and DAC. Here we are adding tube buffer instead of op-amps after DAC chip and change the original XLR analog output to RCA.
SRC2496 includes good Asahi Kasei AK4393 DAC chip and upsampling 24 bit / 96 kHz function.

This is an newer model of SRC2496 with different pcb.
Tube buffer and power supply for tubes has built.
Used tubes: 6H16Б-В.
Analog audio signal is taken from DAC chip AK4393 straight to the tube buffer.
Original XLR Cannon sockets from analog output are removed. Installed RCA sockets (Neutrik).
This solution is much better than the earlier one as it uses symmetric analog signal from the DAC chip in full scale.
February 2014