Why should a toroidal transformer be shielded?

A toroidal transformer is a type of transformer that has a doughnut-shaped core made of ferromagnetic material. Toroidal transformers have several advantages over conventional transformers, such as higher efficiency, lower weight, and smaller size. However, they also have some drawbacks, such as higher cost and higher leakage flux.

Leakage flux is the magnetic flux that escapes from the core of the transformer and induces currents in nearby conductors. This can cause interference, noise, and heating in the surrounding circuits and devices. To prevent this, a toroidal transformer should be shielded with a metal enclosure that blocks the leakage flux and reduces its effects.

Shielding a toroidal transformer can also improve its performance and safety. By reducing the leakage flux, the shielding can increase the coupling between the primary and secondary windings, which improves the voltage regulation and reduces the losses. Moreover, the shielding can protect the transformer from external magnetic fields that could saturate the core and cause overheating or damage.

Enclose the transformer in an magnetic shield enclosure to make sure it has much lower flux leakage. this kind of transformer has not only a good appearance but also high performance. It effectively reduced the magnetic flux interference to other components. And it is suitable for hi-end audio system.

There is a toroidal transformer shielded, which is developed for vacuum tube preamplifier or headphone amplifier specially. Its primary voltage is AC220v, and its secondary voltage are 170V and dual 3.15V.

👇👇👇

IWISTAO 60W Toroidal Transformer Dedicated Filling Glue Tube Preamp Headphone Amp AC170V 3.15V

What is an O core transformer?

An O core transformer is a type of toroidal transformer that has a circular cross section and no sharp corners. It is different from a regular toroidal transformer, which has a square or rectangular cross section. The advantage of an O core transformer is that it has less flux leakage and less copper loss than a regular toroidal transformer, because it has a shorter mean length of turn (MLT) and less insulation material. An O core transformer also has the same electrical benefits as a regular toroidal transformer, such as low noise, low stray field, high efficiency and compact size.

An O core transformer is made from grain oriented silicon steel, which has high permeability and low core loss. The steel strip is continuously pointed towards each end to produce a circular cross section. The transformer core is then wound with primary and secondary coils over the core. The winding process is similar to that of a regular toroidal transformer, but it requires more precision and skill.

O core transformers are suitable for applications that require a low profile and a high power rating. They can be used for power supplies, audio amplifiers, medical equipment, lighting systems and other devices that need reliable and efficient power conversion.

👇 👇 👇

IWISTAO 150W O Type Transformer 4N OFC Dual 18V or 22V 15-0-15V for DAC Preamp Headphone Amplifier

Let everything follow the wind from Black Voice Tube Preamplifier plus SE 6P1 Tube Amplifier

Let everything follow the wind from Black Voice Tube Preamplifier plus SE 6P1 Tube Amplifier

Let everything follow the wind, the song is Cantonese one, and it is played from a tube preamplifier with 6N3(replacement US GE5670) plus 6N5P ( replacement GE 6080), plus single-ended 6P1 tube amplifier. Also, the tube amplifier is a headphone amplifier with 1W output.

And the music sourcing from Bluetooth receiver that is Bluetooth 4.2 version CSR64215, which is connected wireless with the  virtual CD player of notebook played.

Tube Earphone Amplifier 12 ~ 600 ohms Russian 6922H Pre-amp Class A Amp HIFI Constant Current Simple No Casing Audio DIY High Quality

Tube Earphone Amplifier 12 ~ 600 ohms Russian 6922H Pre-amp Class A Amp HIFI Constant Current Simple No Casing Audio DIY High Quality 

It is a high value and cute headphone amplifier hook up to your PC / Mp3 /MP4/ Tablet / any stereo devices. You can have a powerful, dynamic and sweet TUBE SOUND from your headphone! You’ll be astounded at the improvement in sound quality, dynamic range, meticulous transparency, completely demonstrate its high performance and analytical ability, it can also connect with power amplifier such as a high performance pre amplifier to improve your HIFI system.

 

More details, please find https://www.iwistao.com/products/earphone-amplifier-12-600-ohms-russian-6922h-preamp-class-a-amp-hifi-constant-current?_pos=1&_sid=594ae2301&_ss=r

Tube Headphone Amplifier with Black Voice

Tube Headphone Amplifier with Black Voice

The sound is grand and magnificent, open and wide; performance of each frequency point perfect! In particular, when the use of imported tube like as RCA6080 (or Beijing 6N5P tube), more delicate high-frequency, low frequency more powerful!

The circuit design of "Black voice " is very concise, whole unit only took three tubes, the input stage and amplified by the two pairs of polar transistor 6N3 (or 5670) to constitute SRPP amplification circuit, each one just only for a channel 6N3.The output stage is a low resistance dual triode 6N5P (available 6080 U.S. direct replacement) cathode follower constituted, the same every 1 / 2 6N5P responsible for one channel, nothing more. Plus several external RC components and the power section constitute all the circuits. The greatest feature of this unit is no output transformer, the transformer windings out of the two exchanges, a direct supply tube filament, another group rectified and simple multi-level RC Buck, after filtering for tube anode voltage. Although not using filter chokes, filament still used AC power supply. This tube earphone amplifier cannot hear the slightest hum, even when the volume is turned up no signal, the background is quite clean, showing excellent signal to noise ratio.

Product Specifications
1. Frequency range: 30Hz-30 kHz
2. Output impedance: 32-600Ω
3. Output power: 1W
4. Input Interface: RCA × 1 set of interfaces
5. Output Interface: 6.5mm Interface × 1
6. Amp Category: Desktop amp
7. Tubes: 6N3 x 2
       6N5P x 1
8. SNR: 97dB
9. Weight: 5kg
10. Dimension (W * H * D): 160mm * 188mm * 260mm
11. Power supply: AC 220V/50Hz
12. Accessories: Power Cord  x 1.

More details, please visit the link

https://m.aliexpress.com/s/item/1564138170.html?trace=storeDetail2msiteDetail&spm=2114.12010612.0.0.SpY60t#autostay

A tube headphone amplifier with the most completed functions

A tube headphone amplifier with the most completed functions


May it be a tube headphone with the most completed functions? The anwser is yes, it is one of the most completed ES9018S advanced decoder in the industry currently, which can be used as HIFI headphone amplifier or preamplifier. Built-in XMOS (U8) + ES9018S + Bluetooth CSR BC8670, all functions are currently the best configuration. With the highest level decoding solution at one time, it built in USB digital interface XMOS (U8) program to support DSD hardware decoding, also it adopted HIFI tube-transistor hybrid differential amplifier circuit for headphone with strong driving force and Bluetooth CSR BC8670 programs to support high-quality lossless transmission APTX (I2S input receiving a digital signal after ESS9018 decoding preamp output), at the same time it supports OTG input function from the smartphone. Used a unique Patent tube-transistor hybrid differential technology as discrete components core made, it achieve high-quality pre-amplifier output also.


The sound features of the preamplifier and headphone output is warm, delicate, transparent, fast, wide sound field and very dense. If your amplifier is insufficient driving force or its sound is chilled, you can use it to drive your headphones and earbuds or use it as a preamplifier; its sound quality will have significant improvement that can fully make your equipment sound achieve another higher level. Its unique patented technology for the core tube-transistor differential amplifier with full hybrid discrete components and parts designing, includes tube differential amplifier, preamplifier, driving amplification, power amplification and feedback tube recycling, combines the properties of transistors and tubes, so that it gets more delicate and gorgeous sound, and get transistor sound effect with rich transient, thickness, density of the sound quality, and higher driving force, which cannot achieve the sound quality and height if only depend on tube or transistor circuit designing.

There are main features as below.
1. DAC adopt chip ES9018S, which has 32BIT HyperstreamTM DAC patented structure, and time-domain jitter removal, as well as having a 135dB dynamic range and distortion of -120dB, it is highest level of performance in the industry today. This equipment has been full play the strength of this chip, with its high performance, enough to satisfy the most demanding audiophiles.
2. With Coaxial audio signal can input straight into ES9018S for decoding, it support for external high-quality digital audio.
3. Adopted USB digital interface XMOS (U8) with the highest level of 32BIT / 384KHZ ES9018S DAC decoder IC designing in the industry, it supports DSD hardware decoding solution. The benefits of built-in USB digital interface XMOS U8 and DAC decoding integrated, it obtain the best sound quality based on the shortest distance transport.
4. With the highest levels of audio-specific CSR8670 Bluetooth chip, its support Bluetooth playing. CSR8670 is a high-quality Bluetooth 4.0 chip that supports digital output in the industry, the signal straight output into ES9018S decoding, and support for APTX lossless transmission, powerful and excellent sound quality.
5. Input selections with CD / AUX / Bluetooth / USB (OTG mobile phone support input) / COAXIAL audio.
6. Output options: Headphone output or volume controlled preamp output (balanced and unbalanced, RCA output).

7. Fully discrete power amplifier configuration designed for high-fidelity headphone amplifier, strong driving force. And on the back panel, there is Gain switch, headphone range from 8 to 1000Ω impedance adaptation completely when adjustment.

More detail, please visit http://www.aliexpress.com/store/product/Tube-Headphone-Amplifier-Preamplifier-DAC-12AT7-Bluetooth-4-0-CSR8670-XMOS-ES9018-Decoder-DSD-Balanced-Output/725205_32672977168.html

Natual and warm sound from Tube Headphone Amplifier by Model WEVT-PAN13P

Natual and warm sound from Tube Headphone Amplifier by Model WEVT-PAN13P

The circuit of tube headphone amplifier is mature and easy to find, which has developed since the last century. If searched as search engine, you will find many similar circuits, which is the network brings convenience. But not to adopt a same circuit, you can make of the same good sound, which is known by audiophiles. Especially tube amplifier, their sound qualities depend on parts and component selection, and tuning. If tuning tube amp is errors, it led to ordinary sound that may be worse than transistor amplifier; in addition, tube filament shall be powered by AC. So, this is why pure tube amplifier can provide you tube taste sound.

This tube headphone amplifier brings you is no exception, 6N11 plus 6N13P is a classic circuit that is also known as "black voice". In addition, we do some intimate unique designs for subsidiary circuit, its main circuit follows classic "black voice" one. But when you see this amplifier a while, it will make you a fresh feeling, right?

Natual and warm sound from Tube Headphone Amplifier by Model WEVT-PAN13P

Classic Tube Headphone Amp

There are some features as below

1.    Beautiful quaint European appearance will make you be fond of and unwilling to part. The unit adopts a sub-structure, small size (for tube amp is concerned), it is a desktop tube amp, which brings the dual auditory and visual enjoyment.

2.    Furthermore it is adopt a separate power supply, 50W power transformer with special plastic power box, super-soft bold power cable; POWER provide a more robust energy and the interference to a minimum.

3.    The unit filament keeps AC power supply, which allows you to hear tube taste. And it is excellent performance that strong experiences and solid circuit design skill ensure, and there is hardly AC background noise

4.    With a VU meter level display, and use high-quality Taiwan meter header.

5.    Used HIFI material, red Weimaraner audio-specific capacitors, electrolytic import, ALPS 27 type double-volume potentiometer, USA RCA Cinch.

6.    Another trick is that this unit is equipped with a low-voltage startup device, through internal relay to control high-current high-voltage access; it can be described as distinctive design.

7.    It is worth mentioning that, in addition to the amp features, it is a decent quality tube pre-amplifier, because there is 6.35 headphone output (PO) port, also with two RCA Cinch line output (LO ) port. 

Diagram of Connection With Devices

Power Adaptor

Applications and Modification by Audiophiles

Also, it had gotten high recommended by customers.

More details, please visit the link below

http://www.aliexpress.com/store/product/Tube-Headphone-Amplifier-6N11-Pure-Class-A-Preamplifier-Voltage-Amplification-6N5P-Power-Stage-Amp-20-200mW/725205_2054102378.html