Sonic Frontiers SFC-1 - User Manual

SFC-1
CONTROL AMPLIFIER
OPERATING MANUAL
We at Sonic Frontiers are sure that you will derive many years of listening pleasure with your new SFC-1 Control
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 rec-
ommended procedure for handling the small input tubes. Also, check to be sure that none of the 12AT7A/12AU7A 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 molded keying lug (orientation pin) at the base of the tube (not covered
under warranty)!
Recommended Tube Types
Your SFC-1 amplifier is supplied from the factory with one (1) 12AT7A for the stereo input tube (Vl) and two (2)
12AU7A for the phase splitter/driver tubes (V2, LV2). Alternative choices for the 12Al7A tube type are 6201 or ECC81
and ECC82 or 5814LA for the 12AU7A,
The power tubes are factory supplied matched pair E34L (mil-spec EL34/6CA7 types) type but you may also use EL34’s,
6CA7’s or 6550/655OA/KT88/KT90/KT99a types. Although not essential, we recommend the use of matched pairs of
power output tubes for lowest distortion.
1
2790 Brighton Road, Oakville, Ontario, Canada, L6H 5T4 Tel: (905) 829-3838 Fax: (905) 829-3033
SKU# 56620

Summary

Vacuum Tube Handling and Types

Vacuum Tube Handling Procedures

Guidelines for safely handling vacuum tubes, emphasizing clean hands or gloves to prevent contamination and prolong tube life.

Vacuum Tube Installation

Instructions for gently inserting vacuum tubes into sockets, recommending a rocking motion to avoid damaging the keying pin.

Recommended Vacuum Tube Models

Lists factory-equipped and alternative vacuum tube types suitable for the SFC-1 amplifier, including input and output tubes.

Troubleshooting Amplifier Issues

Troubleshooting Checklist

A step-by-step guide to diagnose and resolve common SFC-1 amplifier operational failures, including power and fuse checks.

Amplifier Operation and Setup

Tube Biasing Process

Detailed instructions for adjusting bias controls using the meter to achieve optimal sonic performance and tube longevity.

System Connection Modes

Explanation of the NORMAL/DIRECT switch for selecting audio input paths and their impact on signal purity.

Care, Safety, and Packaging

Cleaning and Ventilation Guidelines

Instructions for maintaining the amplifier's finish and ensuring proper airflow for cooling to prevent overheating.

Essential Safety Precautions

Critical safety warnings covering water, heat, power sources, servicing, and storage during non-use periods.

Warranty and Legal Information

Liability Disclaimer

A statement limiting Sonic Frontiers Inc.'s responsibility for damages or injuries related to the equipment's use or operation.

Five-Year Limited Warranty Terms

Outlines the conditions, exclusions, and procedures for the SFC-1 amplifier's limited warranty, including registration requirements.

Technical Specifications Summary

Sonic Frontiers SFC-1 Specifications

Power

peak power	100 watts/channel
RMS power	50 watts at 1 kHz
power requirements	250 VA 50/60 Hz

Frequency and Impedance

frequency response	4 Hz to 50 kHz + 3.0 dB
input impedance (Normal)	40 Kohms
input impedance (Direct)	80 Kohms

Voltage and Fuse

input sensitivity	0.40V RMS at 1 kHz for 45 watts
fuse requirement (100V to 120V)	2 1/2 Amp 250V slo-blo
fuse requirement (200V to 240V)	1 1/4 Amp 250V slo-blo

Weight and Dimensions

dimensions	19 in. Wide x 17 in. Deep x 7.5 in. High
weight	60 lbs. (27 kg)
tube complement	2 MP - EL34/E34L 1 - 12AT7A 2 - 12AU7A