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16. MAINTENANCE
The Expert 1.3K-FA linear amplifier does not need internal maintenance because it has
a cover without ventilation holes. Since HV tubes are not used, the natural attraction to
dust is eliminated. Therefore the user only needs to periodically check and clean the air
filter on the front panel.
The frequency of air filter inspection depends how dusty the amplifier location is and
how much it is used. We recommend monthly cleaning of the filter. Twice yearly
cleaning of the fans with a soft brush is also recommended.
To clean the filter
a) Remove the front grid cover with the two small screws. Place small screws in
a secure place. DO NOT LOSE THEM.
b) Remove the filter and clean it with care.
c) Reassemble the filter and the grid after having carefully cleaned the
mechanical structure that includes them. Dry filter before re-installing.
Note: Check the filter if an unexpected rise of temperature of the linear is noticed.
Note: Never operate without the filter, as dust could be deposited on the surface of the
heatsink limiting its ability to cool.
Note: To allow the most efficient heat-dissipation of the power amplifier circuits, large
copper parts have been used.