User manual VINCENT KHV-111MK

[. . . ] There are no parts in the appliance that require maintenance by the user. Maintenance/Alterations All equipment that is connected to the domestic mains voltage can be dangerous to the user if not handled properly. The product is only permitted for connection to AC 230Volt/50Hz, for earthed sockets and use in enclosed areas. Altering the product or manipulating its serial number voids the warranty. [. . . ] Please check the contents of the packaging, which in addition to the appliance should contain the following accessories: · It is easily integrated into most stereo systems. Its special feature is the amplifier circuitry that is designed as a hybrid of transistor and tube designs combining both advantages. This advanced technology has its focus on the pure stereo sound quality. Tubes are more sensitive than transistors and may be damaged under inappropriate transport circumstances. Vacuum tubes cannot reach the life span of transistors, even under normal circumstances. But tubes, as they are installed in this appliance, generally operate for several thousand hours. The amount of annual operating hours has an impact on the life expectation of a tube. We recommend switching off the headphone amplifier when you will not use it for several hours. That way most of the tubes will work for many years, but might have to be replaced a few times during the life span of the appliance. Please have the tubes of the amplifier checked if you observe exceptionally high background noise, considerably lower spatiality or stronger distortion. Your dealer will also advice you, when you are not sure, whether replacing the tubes would be suggestive or not in terms of sound after perennial use of the amplifier. POWER: mains switch Use this switch to turn the headphone amplifier on and off. When switched off the device is internally separated from the mains power. PHONES: headphone socket The jack plug of your headphone must be connected to this socket. IN: connectors for the music source You have the choice of making a connection to either the stereo audio source itself (CD player, tuner etc. Power Connector with Fuse holder To establish the power supply, connect the plugs of the power cable to the device and to a suitable wall outlet. Connect the power cable between device and power supply only after all other connections have been made. DURING INSTALLATION PLEASE OBSERVE THE FOLLOWING ADVICE: Protective caps Prior to the first installation the protective plastic caps must be removed from all the connections used at the rear of the unit. Inadequate connections can cause noise interference, failures and malfunctions. Make sure that you do not get these connections confused during installation!Make sure that you do not mix up the analogue connectors for right and left. The RCA plugs for these are mostly colour coded as follows: red for the right channel, black or white for the left channel. [. . . ] In most electric devices the ground potentials of all signals are connected to each other at one central point, where they have one common connection. If the device uses the protective conductor of the wall outlet, the corresponding wire of the line cord is connected intractably to the metal housing of the device. Those signal inputs must not be confused with inputs that accept preamplified signals. Dynamic The volume difference between the quietest and the loudest sounds possible in audio signals (without distortion or transition to noise). [. . . ]