User manual HIWATT CHC

[. . . ] This warranty does not cover damage caused by misuse, accident, neglect or normal wear and tear. Determination of such damage shall be by HIWATT Amplification exclusively. The warranty will be void if repairs have been attempted or performed by anyone other than HIWATT Amplification. [. . . ] WARNING: EXPOSURE TO HIGH SOUND VOLUME MAY CAUSE PERMANENT HEARING DAMAGE. Always connect a loudspeaker system of the correct impedance (4, 8 or 16 Ohms) and set the impedance selector to that value prior to switching on the amplifier. Use only correct two-core loudspeaker cables terminated with mono jack plugs. Use of co-axial leads like guitar leads will invalidate the warranty and may damage the amplifier. In common with all valve amplifiers, it is vital that the amplifier is not operated into an open circuit. Check that the correct fuses are fitted in the fuse holders on the rear panel. Before switching the amplifier on ensure that the standby switch is in the off position. OPERATION · The Classic 50W, 100W heads feature all tube performance, with four ECC83 preamp tubes, four EL34 power tubes and adjustable 4, 8 & 16 ohm output impedance. Dual channel (Normal & Bright) preamp with Low and High sensitivity input and individual volume for each channel, suitable for guitar or bass amplification, with passive or active pickups. With the NORMAL VOL or BRILL VOL full you may find that some high gain pickups and active systems will give a distorted signal. Tone Volume section includes Bass, Treble and Middle EQ controls for tone shaping, and Presence control accentuates overall high and mid frequencies. The tone controls operate on either input and the presence control allows an extremely bright and aggressive sound to be selected at the upper end of the setting. Experienced HIWATT users will confirm that this was always the case with the old heads. All the inputs may be used simultaneously (just like the old bands did). Master Volume Control sets the amount of effective output of the four EL34 power tubes. [. . . ] DON'T place drinks on top of the amplifier or allow any liquid to fall in it. DON'T store the amplifier in damp or dusty conditions, direct sunlight or extremely high temperatures. · · · · · · · · · CLEANING · · · Do not attempt to clean any part of the amplifier when it is switched on. The chassis and front panel may be wiped with a moistened cloth with water and mild detergent or an alcohol based cleaner and then dried. [. . . ]