Good sounding dac modified to allow tube rolling.
Low profile tube sockets were added to the MD5404 board and the cover was modified to allow for the increased height of the tubes such that they protrude through the case (see image). The tubes are 12au7's and if I recall they are either Mullard or RCA's. I also have a couple extra sets of 12au7's which I will include.
The op amps were also replaced with Burr-Brown OPA627AP op amps:
The unit has been well cared for but due to the modifications I am rating the condition at 5/10.