Yesterday, out of nowhere, I started getting all sorts of (digital-like) popping coming from my speakers!
At first I thought it my be my source ("Roku" like a squeezebox, streamed internet radio), but when I turned the source off, the noise continued
I quickly turned everything off and then turned the amp on, it was quiet. Turned the tact on, it was quiet, turned the source back on...Quiet.
Within 5 minutes the noise came back

This time I tried swtiching the input selector on the tact and it went away when I selected any digital input without a connected source (in this case two sources). I then tried the analog inputs and the system was quiet. Back to digital... Noise.
I'm figuring that it is most likely not the power supply or else the noise would have been present while the analog input had been selected but something at the digital input stage.
I'm going to send it in to Tact (I'm sure they'll be able to sort it out)
Just kinda bummed, cuz I've got my RM30s coming this week with no pre.
