Been a while since I done something to my T-Amp. I use Senior discreet amp, now the soundstage is very wide and unbelievably deep, before this everything is in your face, like if you hear artists performs on stage, all the instruments is at the same level as the singer, now everything sits where it supposed to be, and even layers of vocal is prominent, my favorite artists love to use her whisper vocal behind her singing vocal, now I can hear that without any trouble

Another mod I done is using separate power from my PC PSU because when I game, I hear some noise because of my graphics card emit strange high frequency noise to the power line (its normal, as I read around, some components on graphics card emit that, forgot what it is called), I found one old 450W PSU lying around, I open it up, replaced few capacitor with higher quality and jumpstart it to power T-Amp. 15Amps of current available to the T-Amp only. I don't know if that sufficient enough to give boom to it Because the load is so low, I run it totally passive. How does it sounds? Wonderful
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IIRC maximum you can go is 13.8V. If you use 14V maybe it can run, but it won't last long

About the 'not using solid state PSU', please elaborate

Any advantages of doing so?

SMPS is switching PSU!
The T-Amp works well with switching PSU, linear or even battery! (SLA)..
It is not your normal chip amp. Its a Class T and/or D... normal believe/school of thoughts about SMPS being 'dirty' does not apply here...   

ijan, a 12V 1A should suffice but higher is 'better' I am using a 4.2A at 13.6VDC