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O P E R AT I O N
1. Connect your speaker leads, input cables and power cord to the amplifier, making sure the power switch is in the
"OFF" position (down).
2. Using a long-handled slotted screwdriver, rotate all 4 of the adjustment controls fully counter-clockwise.
3. Turn "ON" the amplifiers. After approximately 5 seconds you should see an orange glow appearing inside each
tube. Wait one minute, then turn the selector switch to the "V3" position marked on the chassis. Insert the screwdriv-
er into the corresponding bias control and watch the meter pointer as you slowly rotate your screwdriver clockwise.
Adjust the control until the pointer indicates "50" on the meter. Now rotate the selector switch to the "V4" position
and rotate the V4 bias control clockwise to set the meter pointer at "50." Follow the same procedures for LV3 and
LV4. Wait a few minutes and recheck the settings for all 4 output tubes.
Once you have finished adjusting all 4 bias controls, return the selector switch to the "OFF"
(centre) position.
Your SFS-80 amplifier is now ready for use.
NOTE:The red mark at the "50" point on the meter scale is the maximum recommended bias point for the KT99a out-
put tubes. Setting the bias meter to read in excess of this value will exceed the rated dissipation rating of the tubes
and unnecessarily shorten your tube life with no redeeming sonic benefit. You may, if you wish, operate the tubes at
the "40" mark for somewhat longer tube life. If you are unable to perform the previous adjustments, turn to the
"Trouble-Shooting" section of this manual on Page 3.
C L E A N I N G
The beautiful stainless steel (non-magnetic) finish of the chassis and transformer top covers will last for years. A regu-
lar dusting with a soft, non-abrasive cloth will generally keep the finish looking like new. Fingerprints may be
removed with a small amount of silicon spray, such as WD-40 TM. Be sure to apply any liquid into a soft cleaning
cloth, not directly onto the chassis. At no time should you allow any liquids to drop onto the amplifiers; it may run
into the electronic circuitry underneath and cause damage which will not be covered under your warranty!
T ROU BL E -S H O OT IN G GU I DE
If at any time your SFS-80 amplifier fails to work, follow this simple checklist:
1. Make certain that the A.C. power cord is plugged in firmly, both at the A.C. wall socket and at the A.C. amplifier
socket.
2. Make sure that you have biased the output tubes.
3. Remove the A.C. power cord at the amplifier and open the fuse hatch on the A.C. input socket. Check that:
A. A "slo-blo" fuse, with a rating of 5 amps 250V (0.25" x 1.25"), is installed (or 2.5 Amp 250V (5mm x 20mm) for
European and Asian versions).
B. That the A.C. power fuse is intact and has not blown.
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