Sonic frontiers sfs 80 owners manual

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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 R O U B L E - S H O O T I N G G U I D E 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.