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4. If the power line fuse has blown, replace it with a same size and type fuse of the same rating (5 Amp 250V. slo-
blo - 100 to 120 Volt Countries / 2.5 Amp 250V. - 220 to 240 Volt Countries).
5. Turn on the amplifier. If the amplifier fails to operate, turn off the amplifier, remove the four KT99/KT88 power
tubes (using a glove, cloth or paper towel) and turn the amp on again. If the four small 6DJ8 type tubes glow and the
A.C. line fuse remains intact, it is likely that one of the four power tubes has shorted and should be replaced.
6. If the fuse blows again without the power tubes installed, then you should return the amplifier to your dealer or to
a service depot for repair.
NOTE: Under no circumstances should you replace the A.C. power fuse with one of a higher current rating! Doing so
may cause further damage to the amplifier in the event of a fault condition and will also void your warranty! In addi-
tion, your continued protection from the risk of fire or shock would be seriously compromised.
NOTE:
The surge capabilities of slo-blo fuses from different manufacturers vary. If in doubt, replace your fuse with
one supplied by SONIC FRONTIERS or your distributor.
7. If at anytime you are unable to adjust the meter pointer to read at least "35" on the meter, for any one of the four
power tubes, you should replace the tube as it is nearing the end of its useful life.
8. If you experience a slight "HUM" in your system, you may have a "Ground Loop." This is caused by having
more than one grounded component in your system when all these components run off the same AC circuit. To elimi-
nate this problem, "lift the ground" (either remove the ground prong off your AC cord or use a 3-to-2 adapter plug)
on one of the components, preferably a source component such as a Preamplifier. If you are still unsure, please con-
tact your dealer for further assistance.
O P E R A T E /M U TE S W I T CH
On the back panel of the amplifier, you will see a toggle switch labelled OPERATE/MUTE. This is used to MUTE the
input signal. The primary use of this switch is to allow the user to remove (or connect) INPUT interconnect cable from
the amplifier, preamplifier (or signal source) without the need to "power down" the amp.
This feature will prevent "speaker destroying" bangs, hums, buzzes and thumps from being passed through the ampli-
fier during these cabling changes.
T UB E C AG E
The tube cage serves to both protect the vacuum tubes in the SFS-80 amplifier from physical damage and to prevent
small children or pets from burning themselves. The tube cage snaps easily into the four sockets located at the edge of
the chassis, but is quite difficult to remove. This is intentional in order to maintain safety while allowing quick user
access to tubes and bias controls when needed. (Please refer to the TOP COVER REMOVAL insert in your literature
package).
If possible, the SFS-80 amplifier should be operated without the cage as the tubes will have somewhat better thermal
cooling.
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