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OPERATING MANUAL
We at Sonic Frontiers are sure that you will derive many years of listening pleasure with your new
SFS-50 stereo tube amplifier. 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 sim-
ple instructions in order to keep it looking, operating and sounding its best!
VACUUM TUBES
Handling
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. Use a paper towel or one of
the cotton gloves (supplied) instead. This is also the recommended procedure for handling the small
input tubes. Also, check to be sure that none of the 6DJ8 tube pins are bent when you install them.
Installation
Whenever you remove or insert the input or power tubes into their sockets, handle them gently and
do not force them into the sockets. Instead, "rock" them slightly as you slowly push them into place,
making sure that they are properly seated.
Recommended Tube Types
Your SFS-50 amplifier is supplied from the factory with 6DJ8 tubes for the input and driver stages
(installed into the small sockets). You may also use tubes of the following designations: ECC88,
6922, or 7308/E88CC.
The power tubes are factory supplied matched pair KT88's but you may also use 6550/6550A types.
EL34/6CA7 tubes may also be used but the available output power will be reduced by about 30% to
35 watts. Although not essential, we recommend the use of matched pairs of power output tubes for
lowest distortion.
Tube Biasing
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.
It is essential that the following procedures be followed before you turn on your SFS-50 amplifier.
SFS-50 PRIV ATE
STEREO TUBE AMPLIFIER
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Summary of Contents for Sonic Frontiers Sonic Frontiers SFS-50 PRIVATE
- Page 1 SFS-50 PRIV ATE STEREO TUBE AMPLIFIER OPERATING MANUAL We at Sonic Frontiers are sure that you will derive many years of listening pleasure with your new SFS-50 stereo tube amplifier. 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 sim- ple instructions in order to keep it looking, operating and sounding its best! VACUUM TUBES Handling...
- Page 2 OPERATION 1. Connect your speaker leads, input cable and power cord to each amplifier, making sure the power switch is in the “OFF” position (down). 2. Using a long-handled slotted screwdriver, rotate both of the adjustment controls fully counter- clockwise. 3.
- Page 3 TROUBLE-SHOOTING GUIDE If at any time your SFS-50 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.
- Page 4 (Please refer to the TOP COVER REMOVAL insert in your literature package). If possible, the SFS-50 amplifier should be operated without the cage as the tubes will have some- what better thermal cooling. VENTILATION Your SFS-50 amplifier must be placed on a flat hard surface to allow proper air flow through the venti- lation slots in the bottom panel.
- Page 5 SONIC FRONTIERS INC. reserves the right to make design changes or improvements without the obligation to revise prior versions. All specifications are subject to change without notice. LIMITED FIVE YEAR WARRANTY SONIC FRONTIERS INC. warrants to the purchaser that each SFS-50 Mono Tube Amplifier is free of manufacturing defects for a period of five (5) years from the date of purchase.
- Page 6 TECHNICAL SPECIFICATIONS Power 50 watts RMS from 20 Hz to 20 kHz Frequency Response 6 Hz to 60 kHz + 0.5 dB (1 watt into 8 ohms) 3 Hz to 80 kHz - 3.0 dB Input Impedance 100 Kohms Input Sensitivity 1.4V RMS at 1 kHz for 50 watts Power Requirements 350 VA 50/60 Hz (Maximum)
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