5 шт. - 10 шт./лот! Ультраминиатюрная цифровая усилительная плата PAM8403 мощностью 2 * 3 Вт класса D 2.5 〜 5 В может работать от USB.
128.15
2A3 2A3C 300B KT88 Single-Ended Tube Amplifier | Электронные компоненты и принадлежности
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| Месяц | Минимальная цена | Макс. стоимость | Цена |
|---|---|---|---|
| Aug-19-2025 | 41525.47 руб. | 42356.85 руб. | 41940.5 руб. |
| Jul-19-2025 | 33678.15 руб. | 34352.60 руб. | 34015 руб. |
| Jun-19-2025 | 40871.24 руб. | 41688.84 руб. | 41279.5 руб. |
| May-19-2025 | 40544.61 руб. | 41355.90 руб. | 40949.5 руб. |
| Apr-19-2025 | 32370.32 руб. | 33017.57 руб. | 32693.5 руб. |
| Mar-19-2025 | 39890.51 руб. | 40688.99 руб. | 40289 руб. |
| Feb-19-2025 | 39563.10 руб. | 40354.7 руб. | 39958.5 руб. |
| Jan-19-2025 | 39236.71 руб. | 40021.29 руб. | 39628.5 руб. |
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Характеристики
2A3 2A3C 300B KT88 Single-Ended Tube Amplifier | Электронные компоненты и принадлежности
Описание товара
2A3 single-ended power is not big, if it is to push the speaker below the sensitivity of 90, I recommend the addition of the pre-level. The front stage does not increase the maximum output power of the power amplifier, but adding the front stage will give people a feeling of greater power and greater thrust. People are emotional, not meters, although the meter does not measure the power, but people feel so. I recommend the use of high-quality transistor preamps, because the preamplifier sound is relatively large, suitable for matching transistor amplifiers to add flavor. We need several times the amount of magnification, no predecessor of its own personality, based on this, I designed a built-in preamp, using field tube amplification, after 5 versions of the trial system, has been completely stereotyped. There are 2 effects in the previous stage, 1 is to increase the thrust, 2 is to enhance the low frequency, especially suitable for small caliber, low efficiency or low frequency speakers. There are jumpers on the front level, which can be directly compared. After the trial evaluation by myself and senior fans, using the previous level, the sensitivity of the speaker can be reduced by 3DB. This preamp needs to customize a new power transformer (adding power supply windings), so the previous models can not be upgraded, and if the front stage is not needed now, then the power transformer that adds windings will not be used, and it will not be upgraded in the future. Built-in preamp. The version with the pre-level needs to increase the cost of $65. The price is only equivalent to the price of a pair of signal lines. If you use the external pre-level, in addition to the pre-level money, you need a pair of signal lines and a power cord. And can not guarantee the effect with the amplifier. This built-in preamp is my multi-sample proofing revision and is a cost-effective upgrade.
For customers who need Bluetooth, they need to purchase separately, and support APTX's Bluetooth adapter with $32. Powered by mobile phone charger, with 0.5 m RCA signal line, the amplifier has two sets of inputs, which are connected to one group, and the other set can also be connected to CD/decode/player.
This category has the following series: 2A3C single-ended KT88 single ended 300B single ended The characteristics of several amplifiers will be explained in detail. 2A3 single-ended: If you use sound quality theory, the sound quality of this 2A3 is much better than 300B (mainly in the agility of the sound, the sound can catch the listener's heart as soon as it comes out. Of course, this kind of sound quality needs to be very Good speakers with very high analytical power can understand), not only my 300B, but most of the 300B on the market. This machine is the brainchild of my machine for many years, and it is also the return of the whole year. Making a amp is similar to making a porcelain, although most of it relies on technology, but it also depends on the day. This 2A3 is a design that was unintentionally obtained in many experiments. I was surprised by the sound quality. In the past few years, many high-end customers have used this machine with a variety of advanced speakers. A Hong Kong guest ordered 20 units, each using only mono, pushing a horn of a three-way giant horn, a system with six machines; Taiwanese guests used to push antique Ares speakers, sound quality beyond MBL top suit; a domestic guest used to push Tianlang Edinburgh (40,000 yuan) and gold LS3/5A (20,000 yuan), the effect is very satisfactory; Shijiazhuang friends used to push the Ou Bo Horn, before buying I don't recognize such a cheap machine. After I bought it, I chatted with me for one night. If you have a pair of high-efficiency speakers, congratulations, choosing this 2A3 single-ended will give you a surprising return. With the tube: Dawn 2A3C*2 Russia 6H9*2 Dawn 5Z3PA*1 --------------------- KT88 single-ended: Because of the emergence of 2A3 and 300B, KT88 seems to become a chicken rib. The KT88 single-ended is built with new and heavy materials. Everyone knows the two most important points in determining the sound quality of a amp: the tube and the cow (transformer). The KT88 has been selected for the tube, so the power transformer and output transformer, especially the output transformer, play a decisive role. The power supply cow and the output cow used in this machine are the same as those on the single end of the 300B (the power supply is only different in the filament voltage). The largest power supply cow 114*70 Z11 core in the whole network, with 350 watts of power, provides sufficient power. Output cattle 96 iron core stack thickness 40 (large window, available wire diameter, primary inductance is large) competing products output cattle generally use 76 or 86 iron core. The key is the winding method, which is hand-wound. The primary 4 layers sandwich the secondary 3 layers and the layers are padded to reduce the leakage inductance and distributed capacitance. A friend who knows the technology can ask me for the square wave diagram of this machine, or I can test it myself. Such a machine made by the output cow, low frequency foot (large iron core to make the primary inductance sufficient), high frequency sweet (four clip three layer pad paper, small leakage inductance, low distributed capacitance). In terms of circuit, the two-stage Russian 6H8 common cathode amplification is used to drive KT88. The push level is the same as the 300B. It can be said that this KT88 single-ended, is not a profit model for making money only for the sales. It is completely made of 300B, but the price is very affordable. With the tube: Russia 6H8*2 Dawn KT88*2 Dawning 5Z3PA*1 ---------------------- 300B single-ended: the white horse prince in the gallbladder, because the transformer used has been introduced above, focus on the 300B single-ended push level. 300B this tube, nice but not good. A bad machine, the sound is not as good as KT88 (because KT88's requirements for pusher and transformer are much lower than 300B). The grid negative pressure of 300B is between 60-70, 2A3 is about 45, and KT88 is about 30. It can be seen that the pushing voltage required by 300B is very high, and 300B itself is a tube with very good linearity. It does not need to add loop negative feedback, so the requirements of this driving stage are: low distortion and high output voltage. This is actually quite difficult to do. Common push-level circuits are as follows: 1 Level 1 five-stage tube push. The circuit originated from the original circuit of Xidian Company 91, but this circuit made a mistake, that is, the original 91 circuit is driven by two-stage five-stage tube and has negative feedback. Because of the large input capacitance of the 300B, the high-internal resistance of the five-stage tube pushes, which will cause high frequency deficiency. The negative 3DB frequency response can be as good as 10Khz. A friend of this type of machine can take an oscilloscope to measure the square wave of 10Khz, has it changed the triangle wave. Moreover, the first-level five-stage tube push is less than 300B, the volume is small, and there is no strength. The advantage is that because of the high frequency attenuation, the intermediate frequency is relatively prominent, and the likes of such circuits are generally "old fans". The so-called old fans have two meanings, one is that the fever is long, the other is because the time is long, so the age is also long, and the old man is not able to hear high frequency because of hearing loss, so there are high frequency and no high frequency. Machines, the elderly can not hear high frequency, and such machines are rich in medium frequency, and will be considered by these old fans to be bold. I have not found that there are regular amps and big factories that have a level five-level tube to promote the sale of 300B goods. Such circuits are popular among the people. I think this type of circuit should add feedback to become a pure final stage plus a pre-stage, or an input cow with more than 4 times gain to compensate for insufficient thrust and high frequency attenuation. 2 6H8/6SN7/6N8P two-stage common cathode amplification. Practice has proved that this circuit has sufficient gain, pushes the stage output voltage high, and has low distortion, which is a good push circuit. This circuit is used by this unit. 3 After the primary triode is amplified, the RC is coupled to the primary SRPP circuit for amplification. The SRPP circuit is a parallel push-pull circuit with high output voltage and low distortion, which is also a good driving stage. 4 After the primary triode/five-stage tube is amplified, the resistance-capacitance is coupled to the primary power tube (triode or five-stage tube connected to the triode) to push 300B. Why use the power tube, because the power tube is also driven to meet the high input voltage and low distortion, but I do not accept the 1-2 watt power tube to push the 8 watt 300B. 5 Commonly known as the bull boost circuit, that is, after the primary triode/five-stage tube is amplified, the resistance-capacitance is coupled to a triode with a lower internal resistance or a five-stage power sub-tube (connected to a triode)--whether it is connected to a triode because it is connected to a triode The internal resistance becomes lower and the linearity becomes better, and then the push transformer is coupled to the 300B for pushing. The advantage is that the 300B has a gate flow during large dynamics, which can be absorbed by the transformer. Therefore, the force water of such a circuit will be larger than the above circuit. However, the performance bottleneck of the whole machine becomes the performance of the transformer. A good-performing push-pull transformer is very difficult to manufacture and expensive. The poor performance of the transformer seriously affects the sound quality, but it is not worth the candle. Machines that purchase such circuits must be polished to the eye, and there is no instrumentation to be cautious. With the tube: Russia 6H8*2 Noble Voice 300B*2 Shuguang 5Z3PA*1 Attention: The two thick feet of 2A3 or 300B electronic tubes are at the back and the thin feet are at the front. Do not insert them wrongly. Only the thickness of the pins is used as the basis for judgment, and the signs cannot be used to judge. Other pipes have protrusions on the positioning keys, which are inserted into the grooves of the pipe seat. The rear terminal is 840048 array, 8 ohm 6 ohmspeaker is connected to 08, 4 ohm5 ohm speaker is connected to 04. On the left is the power switch, and on the right is the source selection switch. There are two sets of audio source inputs, which are the same, one red and one white, which can be connected to CD, decode, etc., with the switch on the right. 2A3C single-ended
KT88 single ended
300B single ended
Meter Head night view
Net cover needs to be purchased separately
Back wiring
Трекер стоимости
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Новые отзывы о товарах
Екатерина 19 Декабря 2021, 06:13 #
Заказала эти серьги из стерлингового серебра 925 пробы и никапельки не пожалела. Они просто великолепны, даже еще лучше в жизни,... Читать отзыв полностью...
Екатерина 19 Декабря 2021, 06:58 #
Давно хотела себе именно такие часы. В золотом корпусе с украшениями. Если сказать буквально в нескольких словах, то они просто... Читать отзыв полностью...
VACHESLAV 14 Августа 2023, 12:00 #
Какая цена этого товара?Могу ли я купить и получить этот товар с доставкой в РФ г ВОЛГОГРАД.Оплата б/к" МИР".... Читать отзыв полностью...
Екатерина 19 Декабря 2021, 08:10 #
Красивые, яркие, интересные и очень оригинальные серьги. Мне они понравились буквально с первого взгляда. Нисколько не пожалела, что их заказала.... Читать отзыв полностью...
Maciej 14 Января 2025, 15:54 #
Извините, как зовут женщину на прикрепленной фотографии?... Читать отзыв полностью...
Екатерина 23 Декабря 2021, 10:32 #
Просто невероятно элегантное платье, если сказать буквально в нескольких словах. По факту оно оказалось еще лучше, чем на фотографии на... Читать отзыв полностью...
Просто чудесные серьги. По-другому и не скажешь. Нисколько не пожалела, что оформила заказ именно на них. Качество просто супер, если... Читать отзыв полностью...