The amplifier is rated at 8/10 because of the age; there are no blemishes. It is considered as sensitive to the type of tubes that are used. Some tubes are designed for clarity, others for voice renditions, others for orchestral music. Consequently, the tubes were removed and used on my main system. (BAT amp with Avantgarde Duo). The unit is sold at a huge discount because I prefer that the buyer acquire his own tubes according to his preference. Also, in buying a unit with tubes, the buyer cannot be sure of their condition/age. This unit was kept as a back-up but was not used for 11 years.