These components are Klaus Bunge's clones of Symphonic Lines stratospherically priced amp and preamp.They are built with the same circuits as the ultra expensive units.Absolute Sound called the Khartago one of the greatest bargains in high end audio. And,they have the same tonal balance,with some limitations. Also,they have a transferable 20 year warranty,This means that 14 years still remain on the warranty.The candela is a tube preamp. I purchased on the strength of the superb review of the Khartago.It is a marvelous preamp. Klaus Bunge is the distributor of SYmphonic and an engineer and designer in his own right. These two components are the Extreme and deluxe models of both components. The Absolute Sound,"One of the 50 greatest bargains in High End Audio".