Instruction/ maintenance manual of the product Classic Vacuum Tube Preamplifier Sunfire
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2 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 User's Manual 15. T o prevent electric shock , do not use this polarized plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.
4 User's Manual Your Classic preamplifier should reach you in perfect condition. If you do notice any shipping damage, please contact your Sunfire Dealer immediately. Gently remove the Classic preamplifier from its packing materials with care, so as to avoid damage to or loss of any packing materials.
5 User's Manual Gain control Power on/off Power on/off 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.
6 User's Manual Front Panel Features 1 5 6 7 8 11 10 9 4 2 3 Front Panel Features 4. Remote window This window should be kept clear of obstruction for the remote control to work. 5. Stereo/Mono Switch This sums the left and right inputs so the main outputs will have identical signals.
7 User's Manual Front Panel Features 7. Contour On/Off In the OFF position, the contour circuits are bypassed and the two contour controls (11) will have no effect. In the ON position, the signal frequency response can be adjusted by the contour controls to suit your taste.
8 User's Manual TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. WARNING S/N PASSIVE PRECISION INVERSE RIAA PHONO NETWORK 2 AMP AGC OUTPUTS LINE INPU.
9 User's Manual Rear Panel Features 6. T ape 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.
10 User's Manual Observe the following precautions when choosing a location for your Classic vacuum tube preamplifier: • The Classic is an all-vacuum tube design. It may be operated at any angle, and has modest ventilation requirements. Do not cover the side ventilation slots.
11 User's Manual 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.
12 User's Manual efforts on the part of the transformer designer are required, and the resulting cost will almost always be many hundreds of dollars. Less expensive transformers will be quiet, but will usually exhibit ringing, phase shift, and some low frequency distortion.
13 User's Manual Phono Connections 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.
14 User's Manual CD player Connections 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.
15 User's Manual T ape 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.
16 User's Manual Amplifier Connections: unbalanced RCA If your amplifier has RCA inputs, you can connect them to the preamplifier ’ s Main 1 or Main 2 outputs.
17 User's Manual Amplifier Connections: balanced XLR 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.
18 User's Manual Phono Inputs RIAA curve Moving Magnet input Gain = 40dB to tape out Overload = 100mV @ 1 kHz. Input Impedance = 47 Ω Noise: better than 82 dB, IHF-A, below 10mVrms at 1 kHz Moving Coil input Gain = 60dB to tape out Overload = 5.
19 User's Manual 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- ti.
20 User's Manual Loud howl, squeal, or whistle. • The Tape Monitor switch is engaged while microphones (in the same room as the speakers) are connected to a tape deck for recording. • Put the cat out. Solo voices, or instruments sound thin, shrill or distorted.
21 User's Manual 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.
22 User's Manual 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.
23 User's Manual Limited W arranty Sunfire Corporation is proud of its prod- ucts which have been built with care using advanced technology and premium compo- nent parts.
Manual Part number : 913-012-00 Rev C.
An important point after buying a device Sunfire Classic Vacuum Tube Preamplifier (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Sunfire Classic Vacuum Tube Preamplifier yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Sunfire Classic Vacuum Tube Preamplifier - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Sunfire Classic Vacuum Tube Preamplifier you will learn all the available features of the product, as well as information on its operation. The information that you get Sunfire Classic Vacuum Tube Preamplifier will certainly help you make a decision on the purchase.
If you already are a holder of Sunfire Classic Vacuum Tube Preamplifier, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Sunfire Classic Vacuum Tube Preamplifier.
However, one of the most important roles played by the user manual is to help in solving problems with Sunfire Classic Vacuum Tube Preamplifier. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Sunfire Classic Vacuum Tube Preamplifier along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
