This pre amp was purchased in kit form as supplied by Transcendant Sound. I have owned it for 18 months and it is now up for sale. A tube based pre, the spec can be seen here - [URL]http://www.transcendentsound.com/preamp%20kit.htm[/URL] It has has some modifications - Output caps replaced with Mcap silver in oil All valves replaced with Mullard NOS Internal rewire with Coherent Connissuer ERS material over internal wires and around TX's Pseudo shunt on volume control implemented with Vishay resistors Elma selector switch This is a very nice sounding valve pre with good imaging, bass control and treble extension. I am asking £375 + P&P, although more than the kit price this is already built and the modifications alone cost over £100