Here we have an ART DI/O Dac. To avoid confusion, the mfg. name is Applied Research Technology (ART) and this is both Digital to Analog and Analog to Digital Converter. The A to D process includes one tube, a 12ax7, in the circuit.
I have only used this unit as D/A and as a result removed the tube and kept it in the drawer. Total use to date has been modest. I am shipping this DAC with a total of (3) tubes. I do not have a tube tester but I found a Sovtek 12ax7, a tube labeled 7025 and a similar looking tube on which I cannot see the number. I cannot guarantee the tubes, but it is likely that the Sovtek 12ax7 will be fine. This dac has fairly high output and it works well with a variety of preamps and also passive preamps due to its relatively high output. It is very dynamic and also detailed...and this compares well with several much more expensive DACs with which I have done A/B comparisons. Since this was designed mainly for the pro market, you will note that the inputs are 1/4" (adaptors readily available for rca) and the output is rca/coax. The power supply has been upgraded to 9V 1300mA and I believe the stock power supply put out about 1000mA. Per photos you will note physical condition of the unit is excellent...I would give it an 8 out of 10 with minor surface wear visible...and you will note tape on the wall wart...sorry, but this particular one started to come apart at the seam...tape holds it in place just fine...alternately, it is relatively easy to find a replacement wall wart but there would be NO practical reason to do so.
Below are some notes I found on line. This is guaranteed to be excellent, as described, or money refunded. Will ship to 48 states usps insured for flat $10...NYC local pickup and inspection is ok, no charge. Shipping to other locations, please contact seller first.
Here is some reviewer info:
It has been well over a year and a half since my last digital to analog converter (DAC) shootout. Back in February of 2000 it was theMSB Gold Link versus the Audio Note DAC Kit 1.1. Since that time both units have been subjected to various upgrades by the manufacture. Longstanding audiophiles realize that changes to DACs seem to go at a blinding pace. Not as fast as Intel releases processor chips though. This also may be why many people are playing the waiting game with DVD-Audio and SACD technology. Like computers, they get better and cheaper as time marches onward (and possibly waiting for more DVD-Audio/SACD software releases). In the end many of us have hundreds, if not thousands, of CDs and look for ways to enhance our musical enjoyment with our current music collection. Enter the Applied Research and Technology (ART) DI/O and Audio Note DAC Kit 1.2.