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SFS-40 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-40 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
simple 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. Over-enthusiastic "rocking" may snap-off the moulded
keying lug (orientation pin) at the base of the tube (not covered under warranty)!
Recommended Tube Types
Your SFS-40 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/E188CC.
The power tubes are factory supplied matched pair EL34 (mil-spec, sometimes called E34L's) type
but you may also use E34L's, 6CA7's or 6550/6550A/KT88/KT90/KT99a types. Although not essen-
tial, 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 four slot-
ted 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-40 amplifier.
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Summary of Contents for Sonic Frontiers Sonic Frontiers SFS-40
- Page 1 SFS-40 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-40 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 simple instructions in order to keep it looking, operating and sounding its best! VACUUM TUBES Handling...
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Page 2: Operation
OPERATION 1. Connect your speaker leads and input cable on the amplifier, making sure the power switch is in the “OFF” position (down). 2. Using a long-handled slotted screwdriver, rotate all of the adjustment controls fully counter-clockwise. 3. Turn “ON” the amplifier. After approximately 5 seconds you should see an orange glow appearing inside each tube. -
Page 3: Troubleshooting Guide
TROUBLE-SHOOTING GUIDE If at any time your SFS-40 amplifier fails to work, follow this simple checklist: 1. Make certain that the A.C. power cord is plugged in firmly at the A.C. wall socket. 2. Make sure that you have biased the output tubes. 3. -
Page 4: Packing Material
VENTILATION Your SFS-40 amplifier must be placed on a flat hard surface to allow proper air flow through the ven- tilation slots in the bottom panel. Failure to do so may result in overheating of electronic compo- nents inside the unit and possible damage to your amplifier. PACKING MATERIAL We recommend that you retain all of the packing material and shipping boxes for your SFS-40 amplifier. -
Page 5: Limited Five Year Warranty
LIMITED FIVE YEAR WARRANTY SONIC FRONTIERS INC. warrants to the purchaser that each SFS-40 Stereo Tube Amplifier is free of manufacturing defects for a period of five (5) years from the date of purchase. This five (5) year limited non-transferable warranty excludes all vacuum tubes, which we warrant for a period of 1 year. - Page 6 TECHNICAL SPECIFICATIONS Power 45 watts RMS from 20 Hz to 20 kHz 50 watts RMS at 1 kHz (40 ma. bias, 1 channel driven) Frequency Response 5 Hz to 40 kHz + 0.5 dB (1 watt into 3.5 ohms) 4 Hz to 90 kHz - 3.0 dB Input Impedance 100 Kohms Input Sensitivity...