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Q-3535 owners manual



Stereo main amplifier
DELUXE 0-3535

■ What is stereo playback?

Those who saw Cinerama would have been amazed by the power and truth of this vast screen, and at the same time would have been amazed at the sound that steadily approached them. That's right. That sound is stereo. Recently we started to record and broadcast the same things as Cinerama. Two amplifiers and speakers have been used left and right for the flat sound, and different sounds are output from each to achieve dispersion. The moving state of the sound and the position of the instrument are clarified as in the demonstration. It's a drawing method. Sitting in front of the stage ... It is a three-dimensional reproduction that reproduces the feeling as it is.

■ About stereo amplifier .....

When playing in 3D, the first problem is the amplifier. This is because, unlike traditional monaural devices, it requires two systems of amplifiers and both require a high level of technology. There are two ways to configure a normal stainless steel playback device: On the one hand, a stereo amplifier with a built-in 2-channel amplifier and, on the other hand, two identical amplifiers. The first is the regulator. It has the great advantages of being extremely easy to use and extremely easy to even out difficult sounds. The Sansui stereo amplifier has a high level of fidelity due to itsconscientious design. It is also reasonably priced, which has already been very well received by professionals.



----------------- Features -----------------

■ Since the two main amplifiers required for stereo are integrated in one, it can be connected to any preamplifier. As with normal amplifiers, you can easily connect speakers. Here so that you can enjoy stereo without any problems.

■ Both channels are very compact even though they can obtain a large output of 35W each, so they are very convenient for handling and transportation.

■ It has the advantage that it can be switched to monaural and stereo with a single switch. Since 70W output can be obtained for monaural use, it can be fully utilized as an amplifier for PA as well as for hi-fi.

■ Since we use a hood that takes into account the temperature rise and protection of the vacuum tube, you can safely use it no matter where you place it.

■ Each channel has extremely low distortion at the specified output and, as a stereo amplifier, has excellent electrical properties. In addition, due to its high stability, it can be safely used for long-term continuous power and it can be said to be a perfect stereo main amplifier.

■ It is supplied in a two-tone housing that makes optimal use of modern taste. The sleek design goes well with any room, regardless of whether it is a western style room or a Japanese style room. It can be said that it is the best amplifier for home, theater, and business.

----------------- Technical specifications -----------------

Vacuum tube used:

6AQ8, (12AU7) x 2, (6CA7) x 4, (5AR4) x 2
Power : 70 W (35 W x 2 channels)
Frequency characteristics : 20c / s to 30Kc / s within ± 0.5db
Distortion Rate : 0.8% or less (at maximum power)
S N ratio : -76 dB or more (at maximum power)
Output impedance : 4Ω, 8Ω, 16Ω, 32Ω
Power supply : 100V, 50 ~ 60 c / s
Power consumption : 150VA (when there is no signal)
350VA (at maximum power)
Dimensions / Weight : W432 mm D280 mm H191 mm / 21.5 kg
Electric strategy
Net cash price : 33,800 yen



Q-3535 Name of each part

① Power switch
Normally, the stereo preamplifier and turntable will be powered from the main amplifier's rear wall socket, so all power will be turned off at the same time when that amplifier's switch is turned off. Take special care not to damage the record or table during the performance.

② Left channel input connector
On the right input of the main amplifier, connect the jack from the rear left channel output of the preamp to this input connector. In this case it has to be inserted well.

③ Adjust the volume of the left channel
There is a scale around the controller. So if you're listening in stereo, carefully adjust the volume of each channel. Adjust the volume to suit your room.

④ Stereo / mono selector switch
This main amplifier was specially developed for stereo, but can also be used for mono. Feel free to choose and listen with this switch.

⑤ Adjustment of the light channel volume
In stereo, the original effect of stereo can only be achieved if the volume of the two channels is perfectly matched. Set this control to the same volume as the left channel.

⑥ Right channel input connection
At the input on the left side of the main amplifier, connect the jack from the right channel output terminal of the preamp to this input terminal.

⑦ Left channel output connector
Connect the cable from the left speaker to the connectors on the left. The terminals are marked with C, 4, 8, 16, 32 Ω. Therefore, connect it to the point that corresponds to the speaker. The detailed connection method will be described later.

⑧ Right channel output
Connect the right speaker to the right connectors. Pay attention to the polarity of each channel and connect ➕ to 4, 8, 16 or 32Ω and ➕ to C.

⑨ Fuse
If the fuse blows, open the cover and reinsert the fuse.

⑩ Socket
The main amplifier can be powered by the preamplifier, turntable, etc. To listen to stereo with a simple operation, plug in the power cord of the device used here.

⑪ Power cord
Since this is a cable for the power supply, extreme twisting can cause an unexpected error. Please, handle with care.

⑫ Case
The hood has heat dissipation holes at regular intervals to promote heat dissipation. Therefore, be careful not to put anything on it.



----------------- Before use -----------------

◉ How to choose a stereo preamplifier

① Good signal to noise ratio
Not only the strength of the sound amplified by the amplifier, but also the amount of associated noise plays a role. If the signal-to-noise ratio is poor, no matter how good the main amplifier is, you will not be able to hear a powerful stereo system due to hum and noise.

② The frequency characteristics are flat
The decrease in gain and changes in other characteristics in the stereo preamplifier circuit due to changes in frequency are called frequency characteristics. It is desirable that the characteristics are flat. Stereo performance requires a wide range of frequencies to reproduce all sounds as three-dimensional sound.

③ Excellent circuit configuration and low distortion rate
A rumble filter, volume control, etc. are included in the circuit and it is entirely considered a high-end preamp. Please choose one with a low distortion rate.

⑤ Can be used for all purposes
You should consider the above points when making your selection. In order to fully demonstrate the power of the stereo main amplifier, not only will you not be able to enjoy the original stereoscopic effect if you do not use an excellent preamplifier, but also affect the characteristics of the main amplifier.
In combination with the stereo preamplifier SP-220, which we have specially developed for stereo, you get an excellent presence and powerful stereo sound with simple operation.
The SP-220 is equipped with a rumble filter for removing the rumbling sound of the motor, which is rarely seen in conventional amplifiers, and a loudness that gives the characteristics that are just right for your ears when the volume is turned down. If the main amplifier is used as 2 channels (high and low frequencies) it can be crossed over in 500 cycles and connected to both high and low amplifiers.

◉ How to choose and arrange speakers

The Q-3535 is a high-performance stereo main amplifier that reproduces all sounds within the audible frequency as a three-dimensional tone. However, since the speaker actually transmits the sound to the ear, the frequency characteristics and dynamic range are mainly determined by the speaker. I will in the end. Keep this in mind when choosing a speaker when choosing a speaker with good characteristics and excellent attenuation. If you have a speaker, please prepare the same speaker that you are currently using to meet the above conditions. It is important to take this into account, especially when listening to stereo, and find ways to keep the sound from becoming too different. The placement of the speakers is also one of the important conditions. Ideally, the two speakers should be heard at a distance of 1 to 1.5 meters for 4.5 tatami mats, 1 to 2 meters for 6 tatami mats and 2 to 3 meters for 8 tatami mats. In terms of stereo performance, the most effective position is the point where the corners of the isosceles triangle are connected to the two speakers as a base and the side is extended. If the phases of the two speakers do not match, the output sound will be separated and the real stereoscopic effect will not be displayed. Only when the phases match can you achieve a wonderful and powerful three-dimensional effect. If there is a hard object such as a wall on the front or side of the speaker, the sound from the speaker is reflected once and the stereo effect is reduced. Please choose a location that does not affect the walls and reverberation characteristics as much as possible. If it's inevitable, it's a good idea to use a curtain.


◉ Speaker connection

Connect the two speakers as shown in Fig. 5.
When combining speakers, the phase must be adjusted. Connect the left channel to the left connector and the right channel to the right connector. The latest 2W ay.3Way loudspeakers have coding ➖ or red / blue color coding. Therefore, pay attention to the polarity ➕ to the 4, 8, 16, 32 Ω side of the connection and ➖ to the side of the connection. Connect each terminal to C. If you want to hear stereophonic sound by dividing the speakers of each channel into three types of high, medium and low frequencies, use them in combination as shown in Fig. 2. It is important that the cable does not touch the case when connecting.

----------------- How to use -----------------

◉ First connect the output connection of the preamplifier to the input connection on the front of the main amplifier. (See Fig. 4)

◉ Next, switch the selector switch in the middle of the front panel to stereo or mono, whichever you prefer.

◉ At this point, the volume controls for both the left and right channels must be decreased in the opposite direction to the hands of the watch.

◉ Then connect the power cord to the 100 V AC power supply (turn on the power switch if the preamplifier has one), and turn on the power switch of this unit.

◉ Finally set the volume for both channels to the same scale. In this case, it is better to adjust the volume on the preamp and set the main amplifier volume to the maximum for better results. Both channels are now perfectly coordinated.

◉ After that, pay close attention to the speaker layout and phase, and enjoy excellent three-dimensional performance.

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How to actually hear stereo ...

You already know what stereo looks like due to the proliferation of stereo recordings and stereoscopic transmission by NHK and some private broadcasters. Then what type of connection and arrangement should be used to actually operate the amplifier and hear powerful three-dimensional sound? Typically, when listening to symphonies or light music at a concert, strings, wind instruments, percussion instruments, etc. are placed on a wide stage so that, from the audience's point of view, the tones of each of the 50 to 100 instruments come from each direction. As it steps in, you can feel the sound itself is expansive. In a conventional high-fidelity device, the recording or broadcast is played back by a single loudspeaker system. Even if the sound separation is excellent, the sound propagation, the movement of the sound, and the direction of the sound become as if they actually exist. I just couldn't get it out. Hence, a new stereo system has been born that can express the vibrancy of sound as if it were actually being heard. Since the sound is picked up separately by the left and right microphone, a stereo amplifier must be used during playback to output the sound through the separate left and right speakers. If you combine the SP-220 and Q-3535 and connect excellent speakers, stereo is sufficient not only for home use but also for business use and stereo concerts in theaters and halls. ・ You can enjoy Hi-Fi.

◉ Speaker placement

As already mentioned, two sets of speakers and sound boxes with the same properties are required for stereo playback. Arrange the speakers as shown in Figure 7 and listen at the apex of the isosceles triangle with the two speakers as the base. As shown below, it is also necessary to keep a reasonable distance from the speakers according to the size of the room.

4.5 Tatami mats
...... The middle of the two ......  speaker is within 1.5 m

6 tatami mats
...... The middle of the two ......  speaker is within 2 m

8 tatami mats
...... The middle of the two ......  speaker is within 3 m

In halls and theaters, expand the space according to the size.

◉ Amplifier setting

A volume meter is required for a perfect balance setting. Normally, however, you should play a traditional LP recording with a stereo cartridge so that the playback sound can be heard from the exact center at the vertex of the triangle. This is the time when the left and right are perfectly balanced so you can just play the stereo recording.
To enjoy stereo well, put a thin curtain in front of the speaker so that you cannot see the sound source directly, or close your eyes and listen to the performance.

Sansui Electric Co., Ltd.
460 Izumi-cho, Suginami-ku, Tokyo
Tokyo phone (328) representative 0111-10

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