SAM-A1 Owner’s Manual
FSL0132
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FSL0132 Version 5.1 © 2020 Fireworks Solutions Limited Page 15
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7.
Installing or removing valves
Before carrying out any work on the amplifier the unit must be switched off, isolated from the
supply and allowed to cool.
HANDLE VALVES WITH CARE!!!
Valves are glass and fragile; even if they are not visibly damaged, incorrect handling can result in
the breaking of their hermetic seal allowing air into the valves resulting in their untimely demise.
Dropping valves is also a bad idea as a fall on to a hard surface can dislodge the internal
mechanical arrangement of the valve resulting in premature failure and internal short circuits
which can damage the amplifier.
If you have dropped your valves during the installation – do not switch on your amplifier; contact
us and we will arrange for your valves to be sent back to us to be tested before you fit them.
Follow the following steps to remove and insert valves from their bases in the amplifier.
7.1.1.
How to insert a valve into its base.
Use suitable gloves or wrap a microfiber cloth around the valve (to avoid marking the valve and to
protect against the unlikely event that the glass envelope breaks).
Valve base – top view (note pin 1 identified)
Note that there is only one way that a valve can be inserted in to its socket/base (see image of
valve base). Holding the valve close to the base, align the pins with the sockets in the valve base
and push the valve firmly in to its base with a small circular motion as illustrated.
Ensure that the valve pins are fully inserted in their sockets (no pins visible) and that the valve is
vertical/perpendicular to the valve base.
Inserting a valve in to its base.
