HP amp platform:
NU Audio sound card (1st edition)
Topping D90 DAC (MQA version)
Border Patrol DAC (SEI version)
Hafler HA75 DAC
*w/ Mullard 12AX7 NOS British tube
LTA MZ3 HP amp
*w/ Sylvania Black Plate Bad Boys & Mullard 6201 vintage British tubes