I have a 45A, even stock it never sounded "grainy," but it
did improve with some better parts in the power supply,
replacement of the cheap coupling caps, IEC connector for
a better PC, damping and decent ICs. Others(on the yahoo tact users group) report improvements using ERS sheets placed around the power supply and on the DAC.
Also, be sure to switch off the video section, when listening to CDs, DVD-As and SACDs.
did improve with some better parts in the power supply,
replacement of the cheap coupling caps, IEC connector for
a better PC, damping and decent ICs. Others(on the yahoo tact users group) report improvements using ERS sheets placed around the power supply and on the DAC.
Also, be sure to switch off the video section, when listening to CDs, DVD-As and SACDs.