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Single-ended tube amplifier
IWISTAO Tube Amplifier FU50 Power Stage 2x13W Triode Connection Class A Signal-ended with MM Phono Headphone Amp USB Decoder HIFI Audio
Model No: WVEU-FU50
Sweet Peach Series is single-ended Class A tube amplifier, it is designed for HIFI audiophiles to enjoy music with cost-effective, low-power output Class A amplifier, good performance and sound quality, and its overall performance is more satisfactory. Recommend to connect with high-fidelity speakers that sensitivity is 87dB to 92dB.
Advantages of single-ended class A tube amp are that sound is pure and delicate, high-frequency extension of natural human voice, strings are very attractive, especially in triode connection was the most prominent. Because the operating point is selected on the linear characteristic curve segment, nonlinear distortion is relatively small, even harmonic content is high, but also very good sound effects, sound quality is beautiful moist, sweet and pleasant, like as the taste of multi-harp. The unit adopts tube FU50 also called small 300B as power stage, natural and smooth, mellow voice, has a very strong tube taste with expectations.
Designed with a switch for 5 signal inputs, they are MM phono, CD / DVD drive, USB decoder, AUX line, MP3/PC. And designed independence channel to exclude interference between different inputs to ensure no matter what audio input, the unit will not be impacted by other audio input and sound. And you can choose the different signal source according to individual needs.
The unit designed headphone amp after tube amplifier. Headphone amp used the same amp section circuit, after the signal amplified, then output through coupling with the output transformer. So it can be said that it was a pure tube headphone amp, recommend to connect with high resistance Hi-Fi headphones.
Built-in CLC inductor filter for better noise control, the actual noise is almost inaudible, but also further increase supple feel. In order to ensure the lowest noise, recommended the use of high-quality tube amp input signal cable with a shielded, home power good ground, and try to avoid other interference. It is protect effective and prolong the life of power tube that imported high-voltage rectifier relay delay, and have quick rectified speed, high efficiency, and high stability advantages.
Used a large eight-pin power amplifier tube, stocky body, honest look, difficult to link her with the delicate, gentle, elegant and other words, open sound when at first glance, only to find that her sound, the thumb tube is difficult to compare whit FU50 in sound potential and timber.
The unit used the power tube stage FU-50 (or rY-50), it is an original high-frequency emission control, her sister possession of the same series is famous 805 (FU-5), 807 (FU-7), 845 (FU-45), 813 (FU-13) and so on. After it is transplanted to Hi-Fi stereo, its middle and high frequency is transparent bright, airy, grainy good. When connected to a triode connection output, frequency response curve is closer to the famous king tube 300B, so called "small 300B". Suitable for the performance of the human voice, strings and so on. This tube looks simple, but was called extraordinary refined, is also being used in multiple tube amp manufacturers product.
Buy this unit as the cost of tube amplifier only, but also means, you will have a tube headphone amplifier, a MM phono amplifier, a USB decoder and save additional cost and limited space, reduce cumbersome operation between audio equipments.
1. With a 5-way signal inputs that switched on the front, these are MM turntable (Turntables) input, AUX line input, CD / DVD input, PC USB input, and MP3 input.
2. With RIAA compensation amplifying circuit, it can be connected with MM turntables to satisfy your nostalgia, enjoy classic music of analog signal.
3. Built-in USB decoder sound card inside, you can connect directly to a computer, and it will shield low-grade sound card of PC or notebook. After unplug USB cable, the original PC sound restore to work. You can enjoy the tracks on PC’s hard disk or online music sources, and the driver is not needed for XP operating system or above.
4. It can connect with portable player such as MP3, MP4, etc., through AUX line-in.
5. With a headphone output, you can connect those different headphones whose range from 32Ω-600Ω impedance to enjoy yourself music exclusively, after the headset is plugged, automatically cut off the speaker.
6. With a switch for 4Ω, 8Ωimpedance output, you can select the best match based on their speaker impedance.
7. Available for 110V and 220V power supply with a switch, adapt to different national voltage standard.
8. Its sound is more delicate as transistors connections of output are used.
9. With brushed aluminum panel, high-gloss metal knob, and blue power indicator, it looks elegant and very nice appearance.
10. The casing is made of 1mm sheet steel with advanced wrinkle paint process. Also the transformer hoods are made of advanced wrinkle paint process.
11. Output transformers are made of high-purity oxygen-free copper wire with staged wound core, process. Coupling capacitors adopt WIMA red MKP by Germany. Imported high-grade gold-plated RCA signal terminal and gold-plated oxidation Amber 4 / 8 ohms output terminals are used. Signal cable inside adopt Teflon silver plated shielded one.
12. Used two imported 30u/450V electrolytic capacitors plus inductance to constitute CLC type filter.
13. Three-plug power socket for easy replacement HIFI power cord.
14. Adopted imported high-voltage relay delay.
How to fix FU50 tubes to the amplifier
Please fix tubes FU50 as photos showed below. Don't fix them the wrong positions, otherwise the tube will be damaged.
1. Rated output power: 13W × 2 (8 ohms triode connection)
2. Frequency Response: 20Hz - 25KHz
3. Total harmonic distortion: <1% (1kHz)
4. Input Sensitivity: 500mV - 2000mV
5. Input impedance: 100KΩ
6. Output impedance: 4Ω, 8Ω
7. SNR: > 88dB
8. Dimensions (W × H × D):340 × 160 × 230mm
9. Net weight: 10.75Kg
6N3 × 2
6 N1 x 1
FU50 × 2
Power cord x 1
Manual x 1
multi-layer high-strength corrugated carton and foam plastic inside
1. When you get the unit, do not rush to insert the tubes to the unit, please read the manual carefully. Follow the instructions to avoid damage to the tubes or unit.
2. Recommended the unit to connect with HI-FI speakers with sensitivity 87dB-92dB, which is the best match. Low sensitivity speakers will be not good enough at musical detail, expression layering, and is lack of musical taste; too high sensitivity speakers may led to greater distortion.
3. Recommended the unit to connect with fully functional desktop CD as sound sourcing.
4. MM input port is connected Turntables because output level of Turntables is only a few to tens millivolts, so its amplification multiple is very high, it is not suitable to connect high level signal sources such as CD / DVD, etc, whose signal level is a few hundred mV to 2000 mV. If connected with this kind of source, they will distortion for cutting top wave. Note that when used this unit, in addition to connect RCA signal cable to Turntables, also need to take a good connection to ground of the unit, there is a grounding terminal on the rear of the unit, after done, there will not be induced buzz.
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