SAM-A1 Owner’s Manual
FSL0132
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FSL0132 Version 5.1 © 2020 Fireworks Solutions Limited Page 17
8.
Routine Maintenance
The valves are made from glass and they are fragile; if they are smashed or damaged then
dangerous voltages may be accessible if the unit is turned on. This is not classified as normal
operation as intended.
Refer to the safety and warning section of this document. Potentially lethal voltages are accessible
if the unit is operated with the covers or removed (or if the glass valve envelopes are damaged).
Before carrying out any work on the amplifier the unit must be switched off, isolated from the
mains supply and allowed to cool
8.1.
Cleaning
Before carrying out any work on the amplifier the unit must be switched off, isolated from the
supply and allowed to cool.
8.1.1.
Cleaning the case
Marks on the case e.g. fingerprints should be removed with a dry micro-fibre cloth. Particularly
stubborn marks may be removed using a damp cloth e.g. baby wipe followed by a dry microfiber
cloth to dry the surface. If using a damp cloth, do not clean inside the diameter of the cooling vent
holes around each valve base; keep moisture away from the holes and valve bases. If there is any
doubt that moisture has come in to contact with the valve bases, remove the valves and allow the
unit to dry in a warm dry environment for 24hrs before re-fitting the valves or applying power.
White spirit on a cotton cloth can be used (sparingly and occasionally) to remove stubborn marks
and greasy finger prints – always rub in the direction of the grain.
8.1.2.
Cleaning the valves
The valves are glass and they are fragile, In addition, note that the gold/ink labelling on the valve
is very delicate.
DO NOT USE ANY CLEANING AGENTS OR SOLVENTS.
The valves should not be touched in routine use and if they are then gloves (or a microfiber cloth)
should be used to avoid leaving fingerprints. Fingerprints and dust may be removed with a dry
micro-fibre cloth – apply the minimum pressure possible, especially over printed labelling on the
glass.
Take particular care when using the cloth to clean the glass in the area of the labels and printed
quality stamps (unless they are not important to you!). The durability of the identification markings
and quality stamps is very variable depending on the manufacturer and date of manufacture of the
valve. Removing the labels, any OEM quality stamps, or FSL markings from the underside of the
valve will invalidate any warranty on the valves.
