Shuguang Audio SG-211-1 Stereo Tube Amplifier Single-Ended Class A Tube Amp Assembled Rated 15W+15W

Shuguang Audio SG-211-1 Stereo Tube Amplifier Single-Ended Class A Tube Amp Assembled Rated 15W+15W

Description:
It is well known that the sound of 2A3 tube is smooth, sweet, balanced, and extremely delicate, especially the low frequency performance is significantly better than the ordinary 300B, while the 211 tube is warm, mellow, loose, and well balanced. This tube amp combines the sound balance of 2A3 and 211's warmth, generosity, noble sound, good air, and delicate and sweet sound quality. It is a tube amp that is very suitable for listening to human voices.

Sound quality: It is a revised version based on 845 tube amplifier, with mature technology. The new SG-211-1 machine adopts an aluminum alloy chassis, which has a heavy texture, fresh and beautiful, and a gorgeous and noble appearance, but it is not bloated. The transformer drive method is used to subvert the general resistance-capacitance drive tube amplifier in the market. Both the frequency bands and the sound field are as good as possible. The sound of the entire frequency band is balanced, the high frequency is detailed and real, the sound field is grand, and there is a certain power reserve. The driving force is significantly better than that of 300B, the sound is warm and full, and the tone is gorgeous, noble and brilliant.

Power: Usually, tube amp's power is very low, especially the power of single-ended amplifiers on the market for listening to human voices is insufficient, and the music is soft and weak. Usually push-pull circuits are used to increase power, but the crossover distortion of push-pull machines directly affects the tone. In order to solve this problem, SG-211-1 uses a single-ended Class A power amplifier circuit to ensure sound quality, and improves power in the following three aspects: 1. Adopt three-stage continuous push and transformer coupling (in order to save electron tubes and transformers, general amplifiers on the market use two-stage amplification and resistance-capacitance coupling). 2. Increase the number of power transformers for power supply. 3. Select 211 electron tubes with higher power to ensure high power output. The SG-211-1 machine can drive almost all household speakers. Driving floor speakers will also make the music very atmospheric, rich, and full of surging, with strong and solid bass, mellow mid-range, and open high-frequency.

Materials: This tube amplifier is modified on the basis of the 845 tube amplifier. The materials used are very particular and are made of real materials. 1. In terms of parameter quality, we carefully select electronic tube to ensure the perfect combination of the tube and the machine. And the tubes used are all newly produced new tubes, which is convenient for future upgrades. 2. The use of high-quality transformers, the use of brand-new Japanese Z11 film, and brand-new Japanese copper wire. Transformers is sealed with epoxy resin (effectively reducing the noise level of the machine), and at the same time, we use eight transformers. It is powerful to drive speakers.

Specially customized shock absorber feet to improve sound quality.

Technical Parameters:
- Product model: SG-211-1 (transformer drive)
- Product Type: Single-ended Class A Tube Amplifier
- Rated power: 15W+15W (max. 17W)
- Frequency response range (Hz): 20-25kHz
- Noise voltage: less than 1mV
- Signal to noise ratio: 88dB
- Input impedance: 100KΩ
- Output impedance: 4Ω, 8Ω
- Power supply voltage (AC; V): 115V~230V
- Whole machine power consumption: 280W
- Dimensions: 485x280x260xmm
- Net weight of the whole machine: 38kg

Configuration:
- Resistor: RJ military-grade resistor
- Main capacitors: for American EC, Japanese chemical industry, etc.
- Volume potentiometer: Japanese type 27 fully sealed potentiometer
- Welding method: manual scaffolding and mixed welding method of PCB board
- Printed circuit board: 1.6mm thick double-sided epoxy board, thick copper foil
- Power transformer (two): 900 VA, epoxy resin sealing (shockproof, moisture-proof, noise reduction treatment)
- Output transformer (two): 96X60 specification EI type Japan Z11 iron core
- Choke string transformers (two): 8H/0.4A and 20H/0.2A (Epoxy resin has noise reduction, shockproof and moisture-proof treatment)
- Driving transformers (two): parameter technology confidentiality
- Case: Aluminum case

Package Included:
- 1 x Set of Tube Amp

Note:
- Items in silver shell are delivered by default. If you want an amp in black shell, please contact us to pay extra money when purchasing. It includes net cover which is very thick and safe.
- It is assembled.

FAQ:
Q1: Why not produce split machines?
A1: The 211 tube amplifiers on the market are generally split machines for left and right channels, while our machines are combined machines. From the perspective of power, sound quality, safety, and service life, if you use a split machine, the high-voltage and low-voltage output of the power supply can only be mixed and wound on the same transformer, so that the high-voltage power supply voltage and power can not be too high. So the power of the machine is not large, the thrust is not good, and the sound is not dynamic. And the high and low voltage windings wound on the same transformer are prone to breakdown of the high and low voltage windings and lead to safety accidents. After adopting the combined machine, the high-voltage transformer is set up separately, and the output voltage reaches 1050V, and there will be no breakdown causing safety accidents. This not only guarantees the tube amp's power and sound quality, but also guarantees the personal safety of users and the service life of the amp. At the same time, space can be saved.

Q2: Why doesn't this tube amp use tube rectifier? Why not all scaffold welding?
A2: This is a high-power tube amp among household amplifiers. It is impossible to use tube rectifier to supply such a large power. Even with eight rectifier tubes, the high-power output cannot be achieved. Therefore, only transistor rectification can be used. Our machine uses scaffolding and PCB board hybrid welding, instead of all scaffolding welding, because the whole machine uses a lot of components, using nearly 300 components, more than the common tube amplifiers on the market. To save space, the main parts of the sound channel are welded by scaffolding, and the auxiliary parts (such as the protection circuit and the power supply part) are welded on the PCB board, so the hybrid welding method is adopted.

Q3: What are the characteristics of the sound of this tube amp, and what type of music is suitable for listening?
A3: We have been working to improve sound quality. Many original technologies are used to accurately restore the sound, so the sound characteristics of our tube amplifier are: real, natural, and thorough. It faithfully restores vocals, symphony, and string music, and does not favor any timbre. It can be used to listen to music as well as to enjoy film and television.

Q4: What are its advantages?
A4: Cost-effective. Specifically, it has these advantages over other machines on the market: good sound quality, high thrust, and many unique technical means and methods are used to improve sound quality, such as transformer-driven, Class-A single-ended technologies, and single-voltage high-voltage transformers. Power supply ensures high voltage and high power. At the same time, high power is also the basis for good sound quality to ensure good high and low frequency extensibility, open sound field, and excellent tone details. Use a lot of good materials, 8 transformers, 6 electron tubes, and nearly 300 components.