forum.zelfbouwaudio.nl

http://www.tnt-audio.com/ampli/t-preamp_e.html schreef:

As said, the supplied 3.6 VA AC/DC adapter isn't up to its task. It works, but it represents a serious "bottle-neck" to the performance of the T-Preamp. Use a beefy 12 V (or 13.8 v) 3 amperes external power supply, like the one I suggested to use for the T-Amp (HP 143 or 145 from ZG Italy for example). Any reasonable, regulated 12 V power supply of appropriate power (AT LEAST 3 amperes for powering the pair T-Amp and T-Preamp) will suffice. Feel free to try good, switching power supplies or batteries. A good power supply is strongly needed in order to get the best sonic results. DO NOT JUDGE this unit with its stock AC/DC power adapter.
The correct polarity is clearly indicated: central pole = positive (as in the T-Amp). DO NOT use power supplies which exceed 13.8 volts. Electronic components inside the T-Preamp should survive up to 15 volts. Feel free to use high capacity power supplies (even bigger than 5 amperes, if you are using 1 T-Preamp and 2 T-Amp in biamping mode, for example).
Remember that excessive voltage (read: Volts) can kill a component, excessive "power" reserve (read: Amperes) can't. Quite the contrary: the higher, the better.
As for cables, you don't need adapters of any kind, just "plug and play" the unit to your existing system. The supplied interconnect, though not a complete disaster, should be replaced with anything better of audiophile grade.
The T-Preamp, as well as the T-Amp, is a very small and light unit: big cables may flip it upside down. Use few blobs of blue-tac to glue it to the shelf or use something heavy onto its cover (e.g. a big book).
Some warm-up is necessary, I'd say 15 minutes to say the least. The unit can be left on forever, it doesn't get any warm. When the adapter is connected to the mains, the preamp remains permanently in stand-by mode. After you switch it on a couple of seconds are necessary to get the unit playing.
Before judging its sound, take all the time you need: don't underestimate the unit just because is small and inexpensive (many audiophiles made this very mistake with the T-Amp!). Use the same "care" and patience you'd use with an expensive preamplifier.
Then bear in mind its price, a WOW! will easily follow.