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6 Maintenance, cleaning
The amplifier has no need for particular maintenance.
Occasionally check the starting of the ventilator when you switch on the amplifier!
The preamplifier valve is a long life type, probably you will never have to replace it because of aging.
However, if you feel you are losing sound quality you can easily check it by switching on and off the Valve
Loop. Replacing valves must be done by a qualified person. Only replace by using valves of the same type.
Use only soft and dry or dampened cloth for cleaning. Avoid agressive, caustic cleaning materials.
6—14
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