Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for Sunfire Classic Vacuum Tube Preamplifier
Summary of Contents for Sunfire Classic Vacuum Tube Preamplifier
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Page 2: Safety Instructions
User's Manual Safety Instructions 1. Read Instructions -– All the safety and operation instructions should be read before the Sunfire Component is operated. 2. Retain Instructions — The safety and operating instructions should be kept for future reference. 3. Heed Warnings — All warnings on the Component and in these operating instructions should be followed. -
Page 3: Table Of Contents
Tube type and location ... 22 Limited Warranty ... 23 Service assistance ... 23 To find out more about this and other Sunfire products, This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications. -
Page 4: Introduction
User's Manual Introduction Dear Friend, Congratulations on your purchase of the Sunfire Classic Preamplifier. We believe its sophisticated engineering and meticulous craftsmanship will provide you with many years of listening enjoyment. At the heart of the Classic is a high-perfor-... -
Page 5: Overview
Overview The Classic is a preamplifier control center. If you have previous experience with stereo components, you can probably com- plete the input/output connections and make normal use of the basic preamplifier functions without special instructions. We recommend, however, that you read the entire manual at your earliest convenience. -
Page 6: Front Panel Features
User's Manual Front Panel Features 1. Power Switch This is the main AC power switch. Flip the switch up to apply power to the unit. It is good practice to turn the volume control down before turning on, and keep it down until after about 40 seconds of tube warm-up time (when the MUTE lamp turns off, and the ON lamp stops blinking and turns on continuously). -
Page 7: Front Panel Features
This makes slight trimming of levels more convenient. 11. Contour Controls The Sunfire Classic is equipped with a tone-control stage in the signal path after all input selection and tape switching. These controls are switches which select a variety of precise contour curves. -
Page 8: Rear Panel Features
User's Manual Rear Panel Features 1000 WATTS TOTAL REPLACE WITH 2 AMP ORIGINAL TYPE AND RATING ONLY 120 VAC 50/60 Hz 1. AC Line Cord This is heavy-duty cord capable of carrying large currents required by high- power amplifiers. The Classic itself requires only modest power (equivalent to most light bulbs) and may thus be pow- ered by a conventional extension cord if... -
Page 9: Rear Panel Features
6. Tape output These outputs connect to the inputs of a tape deck for recording the source which is currently selected by the preamplifier. Input jacks on your tape deck may be labeled “Line In”, “Aux”, or “Record”, but do not use “Microphone.” It is recommended that DIN-type record/ play sockets not be used if conventional RCA jacks are available at the recorder. -
Page 10: Ac Power Considerations
• Do not expose the unit to rain or moisture. If fluid or a foreign object should enter the unit, immediately turn off the power and contact your Sunfire Dealer. • Avoid excessive exposure to extreme cold or dust. -
Page 11: The Phono Stage
The Phono stage PHONO/LINE INPUTS INVERSE PHONO PHONO MOVING MOVING PHONO LINE COIL MAGNET TUNER PASSIVE PRECISION INVERSE RIAA PHONO NETWORK MM/MC switch connection The optional phono stage contains two independent stereo phono preamplifier inputs which are optimized for specific uses. The type of phono cartridge you are using in the turntable will determine which phono input to use. -
Page 12: The Phono Stage
RIAA equalization curve. Ordinarily of course, with CDs that’s not possible. The next best thing, however, is to use your Sunfire’s Precision Inverse RIAA network to listen to CDs through its classic vacuum tube phono stage: •... -
Page 13: System Configurations
System Configurations The following pages show some typical connections that you might make in your installa- tion. They show how the inputs and outputs of the Classic preamplifier are connected to various audio components. If your turntable is equipped with a Moving Magnet cartridge, connect its audio outputs to the preamplifier’s Moving Magnet inputs as shown. -
Page 14: Cd Player Connections
User's Manual The audio output from your CD player can be connected to the preamplifier’s CD inputs. If your CD player has variable outputs, this will allow you to adjust the CD player’s output volume to match the volume of other components in your system, such as the tape deck or turntable. -
Page 15: Tape Deck Connections
The output from your Tape deck connects to the preamplifier’s TAPE inputs. These inputs are only selected by using the preamplifier’s Tape Monitor switch. The inputs of your Tape deck connect to the preamplifier’s TAPE outputs. These outputs are unaffected by the setting of the volume control or the contour controls. -
Page 16: Amplifier Connections: Unbalanced
User's Manual If your amplifier has RCA inputs, you can connect them to the preamplifier’s Main 1 or Main 2 outputs. It does not matter which pair you use, because they are identical. Main 2 is provided if you want to run a second amplifier, perhaps to play speakers in another room, or to drive an active subwoofer. -
Page 17: Amplifier Connections: Balanced
Amplifier Connections: balanced XLR Amplifier If your amplifier has XLR inputs, it can be connected to the balanced audio outputs as shown. The balanced connections are preferred, as they provide superior noise cancellation and are less susceptible to interference than unbalanced lines. -
Page 18: Specifications
Units built for 110V-120V line voltage can be converted to 220V-240V by means of a modification. This is not simply a switch, and must be performed by a Sunfire Authorized Service Station. Contact Sunfire Technical Services for more information. Muting System The Sunfire Classic employs an electronic “clamper”... -
Page 19: Troubleshooting Guide
Troubleshooting In view of the Classic’s input/output flexibility, the many connecting cables to and from the components which may be con- nected to it, and the large number of possibili- ties for mis-set switches both on the Classic and on the various ancillary components operating with it, obviously it is impossible to offer a complete troubleshooting guide to all of the problems which could, in principle,... -
Page 20: Troubleshooting
In this case the solution is to turn down the power amplifier’s level controls if it has them, or consider having its gain reduced by the manufacturer. Contact Sunfire Techni- cal Services for further information. Except for the condition described above, audible hum will nearly always be found to be due to problems external to the Classic —... -
Page 21: Radio Frequency Interference
Finally we come to the other common source of hum problems, the signal cables and their associated plugs. Inexpensive cables often have mediocre wrapped shield- ing, so better cables may make an audible difference. And it is important that the plug at each end of every cable makes a good, tight fit in its mating socket. -
Page 22: Appendix
Changing the phono stage gain The following gain changes may be performed by experienced electronic techni- cians. Your Sunfire Dealer may be able to recommend a good service/repair shop. Factory set gain of MM Phono is 40 dB. The gain may be changed as follows: 36 dB - change R 11 and R 35 to 3.9 K ohms... -
Page 23: Limited Warranty
Your unit has been crafted to perform properly for many years. Sunfire Corporation offers the following Warranty to you, the owner of a new Sunfire product: The Sunfire Corporation Warranty for the Classic vacuum tube preamplifier is in effect for FIVE years from the date of original retail purchase. - Page 24 Manual Part number : 913-012-00 Rev C...
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