IWISTAO Mono FU50 Tube Amplifier Singal-ended Small 300B with dual 6J4P Preamplifier

IWISTAO Mono FU50 Tube Amplifier Singal-ended Small 300B with dual 6J4P Preamplifier  

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.

This mono FU50 tube amplifier is positioned as a desktop sound system, which adopt a power adapter as power supply to save the space and reduce the weight to compare the traditional tube amplifier.  

Whole casing of the power amplifier adopted aluminum alloy chassis and wooden panel, large gold-plated output and input terminals; mono design with class A single-ended output, the sound is bright and warm. And its preamplifier used 2pcs 6J4P that can be replaced by tube 6H4C, 6AC7.

The actual listening experience, sound neat, vivid and elegant, thick warm quality! High frequency delicate and elegant, quite expensive! Midrange sweet round, warm, aura! Low-frequency strong, dive deep, Tri-band balance, have strong tube taste, reduce grinding most of the digital sound, so that the sound more rounded and it don’t tire to listen sound.

More details, please visit https://www.iwistao.com/products/iwistao-1pc-mono-tube-amplifier-fu50-power-stage-class-a-signal-ended-small-300b-12w-preamplifier-2-x-6j4p-hifi-audio?variant=42938228748

IWISTAO Mono FU50 Tube Amplifier Singal-ended Small 300B with dual 6J4P Preamplifier  

Two FU50 tube amplifier + HIFI Bookshelf Speaker + CD Player 

Another option for music playing -- HIFI Digital Player Turntable

Another option for music playing -- HIFI  Digital Player Turntable 

Except CD player, you have another option for music playing. That is, a HIFI  Digital Player Turntable, you can storage those songs with  MP3, WAV, FLAC, APE format to USB disk or SD card which can  storage high volume songs. It is a turntable when it plays.

HIFI Digital Player Turntable Hardware Decoding ESS Main Chip AK4495 Supports WAV APE FLAC MP3 Support 192K/24BIT Black from IWISTAO HIFI MINIMART2 on Vimeo.
This digital player adopted the latest ESS main chip by American, which is a hardware decoding for mastering digital turntable player. Supports WAV, APE, FLAC, MP3 format, its ultra-high speed core processing chip support to the 192K / 24BIT mastering format, analytical, detail restoring ability is excellent, relaxed nature, rich overtone, better than PCHIFI, its advantage of outputs are better than pure CD output. Its sound pure and details is better than similar products.

For AK4495 have decoding output, there isn’t an external decoder. which is dynamic sound, broad field, excellent extending. Also AK4495 adopted 7.5V power supply firstly with the highest voltage power supply, in order to break through dynamic limitations of traditional 5V power output for DAC. Meanwhile AK4495 also has five kinds of optional built-in digital interpolation filter. As you know, it is very important to a HIFI device that power supply. It uses LM2941 ultra-precision regulator device, it has a much lower noise performance than conventional LM317, LM7805 and other three-terminal regulator. Also, uses oxygen-free copper 50W R-type transformer for power supply, low magnetic leakage, low noise, so that background noise better player

Built-in JRC-end op amps MUS8820, full tone, voice very smooth with a tube taste, for better than OPA2604, LME4972 and others. MUSES8820 is an op amp with second circuit and J-FET input form, which is to be applied and developed for more "real voice" equipment and sound products.

It supports audio formats as below, a) WAV: 192K / 24BIT; b) APE: 96K / 24BIT; c) FLAC: 192K / 24BIT; d) MP3: 44-48K / 16BIT (MP3 is the absence of 192K / 24BIT format)

More details, you can visit 

https://www.iwistao.com/products/hifi-digital-player-turntable-hardware-decoding-ess-main-chip-ak4495-supports-wav-ape-flac-mp3-192k-24bit-black?variant=17798908379251

IWISTAO 300B Bluetooth Tube Amplifier with CSR8670

IWISTAO 300B Bluetooth Tube Amplifier with CSR8670

This is a 300B vacuum tube amplifier with Bluetooth 4.2 technology. Built-in CSR8670 module, you can connect your Bluetooth enabled devices via wireless connect, also can play stream music.

There is a demo below.

IWISTAO FU50 Small 300B 2x8W Vacuum Tube Amplifier PCBA Kit Single-ended Class A DIY Free Tuning

Vacuum tube FU50 is known as the small 300B and close to tube 300B, but the price is much lower than tube 300B, its treble is fine, extension is very good, overtone is excellent, and the vocals are very cordial. Listening to the original sound of the Dream of Red Mansions can feel that it is super strong; listening to symphony and string music is very good, violin is very delicate, more worth playing than the tube EL34. 

This kit's solution uses 6J8P for gain amplification driving, FU50 as single-ended class A output, and tube 5U4C as tube rectification. Its output power is 2x8W. Don’t underestimate its 8w output, it is a Class A state, and much better than the digital power amplifier 50WX2 output and also more powerful than the LM1875's 2x25W.

This finished board is free tuning, you need just insert the vacuum tubes, and connect output and power  transformers. Also, kindly remind to connect your speaker to avoid damaging the output transformers before power on. The kits are made of fine materials and all imported high-voltage capacitors ensure safety and stability. All the seats are gold-plated to ensure good contact. High-power resistors use Panasonic, KOA and other advanced fever resistors.

Meanwhile, we provide the scheme diagram for you information. This is a channel of amplifier part below.

And, there is a power supply part below.

Here is the tubes, FU50, 6J8P, 5U4C.

After you insert the tubes into this small 300B amplifier board, you will get it as photo showed.

More detail, please find, 

https://www.iwistao.com/products/iwistao-fu50-vacuum-tube-amplifier-2x8w-single-ended-class-a-pcba-finished-board-small-300b-diy?variant=13990706020467

Little 7 pcs Vacuum Tube MW/SW Radio 3 Bands AM 535-1605 KHZ Shortwave 2.3-7 MHZ 6-18 MHZ

Little 7 pcs Vacuum Tube MW/SW Radio 3 Bands AM 535-1605 KHZ Shortwave 2.3-7 MHZ 6-18 MHZ 

This is a pure tube 3-band radio, it can receive a medium wave and two band shortwave signal. Tube radio is built in 4-inch small speakers, which can meet listening need for 15 square rooms. If you connect an external 6-8 inch full-range speaker, then there will be a leap in sound volume.

Nobody but you from IWISTAO HIFI 4 Inch Full Range Labyrinth Speaker

Nobody but you from IWISTAO HIFI 4 Inch Full Range Labyrinth Speaker

Nobody but you, the song is from IWISTAO HIFI 4 Inch Full Range Labyrinth Speaker plus single-ended class A 6P1 vacuum tube amplifier. The music source of notebook is connected with a CSR64251 Bluetooth decoder via Bluetooth wireless connection, and music player is foobar2000.  And the video is taken by smartphone.

The speaker cabinet is made of solid wood, and built in labyrinth structure that adopts double back guide pipe to effectively prevent the sound waves from forming standing waves, and sound quality is relatively pure. Also, its speaker unit is a full range one, is made of double 80mm magnet, tarpaulin edge, composite cone, aluminum alloy frame and 25mm coil, which is used in model AP5001 that this monitor speaker cabinet is designed by Japanese designer Mr. Kameyama presided over the design with AS100FL 42Ex speaker unit. After launched in Japanese market, AP5001 achieved very good response, and it was elected as monitor speaker cabinet by Japan's Fuji TV station. The sound is very accurate, full-range balanced, low distortion. This is from her exquisite workmanship can be realized, a large magnet, large elastic wave, long stroke, composite cone, aluminum alloy frames, that is carefully designed products when a glance.

More details, please find here,

IWISTAO HIFI 4 Inch Full Range Labyrinth Speaker 2x60W 4Ohms 92dB Max AKISUI4 Oak for Tube Amp

Advantages of O Type Power Transformer

 Advantages of O Type Power Transformer

Generally, the sound of toroidal transformer is good, large dynamic, less magnetic leakage, more quiet, and low temperature. R type transformer’s voice is warm, low internal resistance, excellent high frequency extension and also the subtle state is very good.

O-type transformer, combined with the advantages of R-type transformer and toroidal one. A completely non-cutting core made of high-flux silicon steel strip, O type transformer is made of this round-section iron core has a small volume and good electrical performance, and is an ideal transformer. The O-shaped and the ring-shaped transformer are completely different. The ring-shaped transformer is made of steel strips. The O type transfomer is a one-piece iron core. In terms of efficiency and magnetic flux leakage, the O-type has an inherent advantage. As actual listening, its performance is very accurate in high frequency characteristics, transient, and detailed.

Compared with toroidal transformer, O type transformer has the following advantages:
a. The average length of the coil is reduced by 11.4%-30%;
b. The coil has no folding angle, which makes the magnetic field distribution more uniform. For Structural features, the core has no fracture, the section is approximately circular and like as an oblate structure, also its height is short and diameter is larger with more uniform structure, so that its leakage magnetic is smaller.

Compared with the R-type transformer, its coil is not limited by the skeleton, and is tightly attached to the core, which is better coupled and more efficient. O-type transformer’s sound quality at sweet and warm aspect has a significant difference in actual comparison with the other transformers.

What is B, P, and G for tube amplifier output transformer?

We had been asked the questions that what B, P, and G for tube amplifier output transformer is. Maybe it is a simple question for tube amplifier audiophiles, there a brief for it below.

The primary of tube amplifier output transformer generally has two, three and five connection terminals.

The circuits of single tube type class A amplifier Among them include:

1. The primary is 2 connection terminals, P is connected to the screen, B is connected to B+ (that is, DC high voltage power supply)
2. The primary is 3 connection terminals, P is connected to the screen, G is a Ultra-linear tap (connected to the second gate of the power amplified tube such as 6P6P, 6P1, 6P14, etc.), B is connected to B+ (that is, DC high-voltage power supply)

 

Push-pull circuit:

1. The primary is 3 connection terminals, the transformer primary has two P terminals, and one B terminal, two P terminals respectively is connected to the screen of tube No and No2, B then connected to B + (that is, high-voltage DC power supply).Here, tube No.1 and No. 2 are two push-pull arms, same as below.
2. The primary five connection terminals, the five primary connection terminals of output transformer are: P1, G1, B, G2, and P2. Among them, P1 is connected to the screen of tube No. 1, G1 is connected to the ultra-linear tap of tube No. 1, P2 is connected to the screen of tube No. 2, G2 is connected to the ultra-linear tap of tube No. 2, B is connected to B+ (that is, DC high voltage power supply). There is an example below for push-pull circuit.

 

IWISTAO HIFI MINI Tube Hybrid Amplifier Bluetooth 4.0 2x28W Output 6N1 Preamp APT-X Black

 IWISTAO HIFI MINI Tube Hybrid Amplifier Bluetooth 4.0 2x28W Output 6N1 Preamp APT-X  Black

This is a mini tube hybrid amplifier, and support Bluetooth 4.0, apt-x, also it has 2 groups RCA inputs. Here, it play music from CD player, there is a demo below.

IWISTAO HIFI MINI Tube Hybrid Amplifier Bluetooth 4.0 2x28W Output 6N1 Preamp APT-X 115/230V Black from IWISTAO HIFI MINIMART1 on Vimeo.

You can use it to play lossless music formats music or network streaming with music player which is compatible with APE or FLCA music format , to enjoy funs of HIFI music. We recognize it is a better companion of your smart phone, tablet PCs and other mobile devices to enjoy wireless fidelity music.

（It played under Bluetooth wireless connection）

   

It is Hybrid designs that Wistao Bluetooth music base station, its preamp adopt 6N1 dual triode tube, power amplifier using high-power integrated IC. This design combines mellow and beautiful sound of tubes with feature of high-power output of high-power integrated IC, its maximum power is up to 2 x 28W, enough to meet your listening needs.


Also simple design of two switches, one is Bluetooth input switch, the other is RCA input of CD signal. It’s up to you to choose using Bluetooth signal input or RCA line input. The right of volume knob allows you to adjust volume of speakers. The rear of Bluetooth music base station is equipped with a banana plug line input, and can switch freely according to your needs, to switch CD input mode.

More details, please find below

IWISTAO HIFI MINI Tube Hybrid Amplifier Bluetooth 4.0 2x28W Output 6N1 Preamp APT-X 230V Black

Ultra-Linear Taps of IWISTAO Output Transformer

Ultra-Linear Taps of IWISTAO Output Transformer 

As an audiophile for tube amplifier, we might know that there are generally three kinds of connection methods for beam tetrode tube of tube amplifier, standard, ultra- linear, and triode connection. Its output power and distortion decrease in turn.

Generally, when we use the power tube, the grid voltage is fixed, which is called standard connection. When the grid is directly connected to the screen, i.e. the beam tetrode is connected to a three-stage tube that called triode connection. The ultra-linear connection is between standard and triode connections. which is to connect the curtain grid to the tap of a certain number of turns of output transformer, consider to increase the output power of the standard connection and the low distortion of the triode one.

Ultra-linearity is a kind of negative feedback, whose principle is to obtain the feedback voltage through the output transformer tap to add to the output tube curtain grid. As the grid voltage changes, the output curve cluster of the tube will change, so the grid voltage can be negative feedback by output voltage changes.

Here is a wire connection diagram for IWISTAO 100w pull-push output transformer below, only for you information.

Also, there is a wire connection diagram for single-end output with Ultra-limear tap.

General Power and Size for IWISTAO Dedicated HIFI Toroidal Transformer

General Power and Size for IWISTAO Dedicated HIFI Toroidal Transformer

• Here, it is a table General Power and Size for IWISTAO Dedicated HIFI Toroidal Transformer.

  
  
  

Related sizes and installation of IWISTAO Output Transformer

Related sizes and installation of IWISTAO Output Transformer

Many customers ask us about the sizes for installation of output trnasformer, here we provide a table for you information.

Horizontal installation

Vertical installation

More details, please visit the link below.

https://www.iwistao.com/collections/output-transformers

How to make the solid wood Bluetooth Speaker by manual

How to make the solid wood Bluetooth Speaker by manual

If you are tired the Bluetooth speaker by mass production and want to find a unique Bluetooth speaker manual with good sound quality, you can come here to check it out.

The location of produce the Bluetooth speaker is a beautiful, peaceful village where is far from the city, then concentrate to make very product by manual and try to give our customers excellent experiences. Please take a look with us.

Here is the rest area. When we are tired, we will go in for a drink and lie down for a while... Think about where your Bluetooth speaker needs to be improved.

Here is our woodworking room where the Bluetooth Spleaker was born.

 

If you are interested in the solid Bluetooth Speakers and want to get more details, please click the link below.

Bluetooth Speaker Handmade Vintage Pure Solid Wood Portable 2x15w AUX U Disk Playing

IWISTAO HIFI 3 Inch Full Range Speaker 1 Pair 2 x 15W Computer Speaker Whole Aluminum Casing

IWISTAO HIFI 3 Inch Full Range Speaker 1 Pair 2 x 15W Computer Speaker Whole Aluminum Casing

It is All-aluminum casing and Ultra-thick material with precision CNC machining by independently developed. Choose a large magnetic 3 inch HIFI full range speaker unit, exquisite and compact, beautiful and generous.

It may be used as a pair of computer desktop speaker, or rear speaker.

There are two options for the casing, one is black and the other is silver.

More details, please find here.

IWISTAO HIFI 3 Inch Full Range Speaker 1 Pair 2 x 15W Computer Speaker Whole Aluminum Casing

IWISTAO Discrete Components Stereo FM Radio Board LA3401 Decoding TDA2030A Line Output

IWISTAO Discrete Components Stereo FM Radio Board LA3401 Decoding TDA2030A Line Output to 2 x 28W Tube Hybrid Amplifier & HIFI Bookshelf Speakers

The version adopts an air variable capacitor.

This is a stereo FM radio finished board with discrete components. You only connect DC12V power adapter and speakers then you can enjoy wonderful FM radio. Or, you may make a wooden casing and DIY it as a vintage radio.

The receiving part adopts the discrete component split frequency tuning head as a HF receiving unit. The PCBA adopts double balanced proportional discriminator with excellent sound quality, and also optimizes its layout of the intermediate frequency circuit PCB, improves the stability of the intermediate frequency. And it uses a LA3401 decoding chip as FM stereo decoder, whose resolution is up to 70dB,its noise ratio is up to 95 dB. At the same time, a first-stage FM mixed signal preamplifier is added, which improve the problem that the LA3401 standard circuit cannot be driven in weak signal, so that each radio station can achieve good mediation resolution. After then, the LA3401 has no decoding noise and is comparable to the LA3450 chip.

The video demo that the output to 2 x 28W Tube Hybrid Amplifier & HIFI Bookshelf Speakers

More details, please find here,

IWISTAO Discrete Components Stereo FM Radio Board LA3401 Decode TDA2030A AMP No Power Adapter

IWISTAO 2X10W HIFI 2-Inch Full Range Speaker Labyrinth Structure Wooden Cabinet 84dB Neodymium Speaker

 IWISTAO 2X10W HIFI 2-Inch Full Range Speaker Labyrinth Structure Wooden Cabinet  84dB Neodymium Speaker 

The full-range speakers are made of labyrinth structure speaker with black.

More details, please find here

IWISTAO 2X10W HIFI 2-Inch Full Range Speaker Labyrinth Structure Wooden Cabinet  84dB Neodymium Speaker 

IWISTAO HIFI 4 Inches Full Range Transparent Labyrinth Speaker

IWISTAO HIFI 4 Inches Full Range Transparent Labyrinth Speaker