Unison Research
Unico Secondo
15
10. SAFETY AND MAINTENANCE
PRECAUTIONS
Never operate the amplifier with either the bottom or top covers
removed.
High voltages are present within the Unico Secondo, which could
cause severe electric shock.
Do not open the amplifier !
There are no user adjustments inside, and none other than those
described in this manual.
For technical assistance or product service please refer to your
Authorised Dealer or to a Unison Research
authorised Service Centre.
Do not spill liquid into the amplifier !
If liquid should be accidentally spilled into the amplifier remove the
mains plug from the wall socket immediately and seek assistance from an
authorised Service Centre before attempting to operate it again.
Before inserting the mains plug into the wall socket ensure that the
switch on the amplifier is in the “OFF” position.
If you do not intend to use the amplifier for a long period of time we
strongly recommend you unplug from the mains at the wall socket.
Valve replacement.
Valve replacement should be carried out using other valves of
the same type. Replace both as a matched pair.
The Unico Secondo uses two valves type ECC83 (12AX7). The
amplifier has been designed for maximum valve life; in laboratory tests
15000 hours life have been exceeded.
If you notice a significant reduction in the output volume, or if the
internal filament of a valve no longer lights up, it will be time to fit a new
pair of valves. Always replace both, using a selected matched pair.
Important! Safety !
Before attempting valve replacement ensure that the amplifier is
switched off and allow sufficient time for the valves to cool. Remove the
mains power cord from the amplifier. If in doubt your Authorised
Dealer or Service Centre will be able to assist with this operation.
Cleaning the Unico Secondo.
Cleaning should be carried out after switching off and allowing the
amplifier to cool down.
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