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. NOTE:The red mark at the “60” point on the meter scale is the maximum recommended bias point for the 6550/KT88 output tubes. Your SFS-50 amplifier is now ready for use. Once you have finished adjusting all 4 bias controls, return the selector switch to the “OFF” (centre) position. Utes and recheck the settings for all 4 output tubes.
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. Adjust the control until the pointer indicates “50” on the meter. Insert the screwdriver into the corresponding bias control and watch the meter pointer as you slowly rotate your screwdriver clockwise. Wait one minute, then turn the selector switch to the “V3” position marked on the chassis. After approximately 5 seconds you should see an orange glow appearing inside each tube. Using a long-handled slotted screwdriver, rotate both of the adjustment controls fully counterclockwise.ģ. Connect your speaker leads, input cable and power cord to each amplifier, making sure the power switch is in the “OFF” position (down).Ģ. It is essential that the following procedures be followed before you turn on your SFS-50 amplifier.ġ. This is a simple yet important function of the front panel meter, the selector switch and the two slotted adjustment controls protruding above the top surface of the chassis. Although not essential, we recommend the use of matched pairs of power output tubes for lowest distortion. E元4/6CA7 tubes may also be used but the available output power will be reduced by about 30% to 35 watts. The power tubes are factory supplied matched pair KT88’s but you may also use 6550/6550A types. You may also use tubes of the following designations: ECC88, 6922, or 7308/E88CC.
#SONIC FRONTIERS SFS 50 DRIVER#
Your SFS-50 amplifier is supplied from the factory with 6DJ8 tubes for the input and driver stages (installed into the small sockets). Instead, “rock” them slightly as you slowly push them into place, making sure that they are properly seated. Whenever you remove or insert the input or power tubes into their sockets, handle them gently and do not force them into the sockets.
#SONIC FRONTIERS SFS 50 INSTALL#
Also, check to be sure that none of the 6DJ8 tube pins are bent when you install them. This is also the recommended procedure for handling the small input tubes. Use a paper towel or one of the cotton gloves (supplied) instead. We suggest that you do not handle the large power tubes with your bare hands or fingers as skin oils deposited on the glass surface can “leach” through the glass envelope and cause the tube to become “gassy.” In other words, your tube life may be shortened unnecessarily.
#SONIC FRONTIERS SFS 50 MANUAL#
This brief operating manual contains important information regarding the operation and care of the amplifier, so be sure to read this manual carefully and follow these simple instructions in order to keep it looking, operating and sounding its best! We at Sonic Frontiers are sure that you will derive many years of listening pleasure with your new SFS-50 stereo tube amplifier.
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