Easy to make the best bile preampi, Vacuum Tube Preamplifier
Keywords: easy to make the best bile
Easy to make the best bile
In recent years, the incense is gradually being recognized and accepted, and a kind of courage is also set off in the hair burning circle. In the coarse machine, the timid stage is simple, and the debugging is easy, so the production is relatively high. Because the enthusiasts have a lot of transistors after performance, they can help you quickly enter the fever realm. "Exogenous Postal Stone" is more suitable for most of the flavors of enthusiasts. Here, several high-level circuits have been given to the reference. The following circuits are two-channel design, and only one channel of the main circuit is given, and the other track is slightly.
1. Horseshoe courage:
The schematic is shown in Figure 1. The circuit imitates the "Reference" tube of the British Horseshors and the tube, and the horseshoshimei is known as the unlikely designed concept of Zall, and is known for the world. Its route is a relatively high price-priced price and is also one of the most easy assembly. It is magnified by 12AX7 and 12AT7, with the characteristics of large output current, average full-frequency performance, high analytical force, sound quality.
The enthusiast can also use and connect the circuit (the JADIS circuit introduced later) will be referred to as the JADIS circuit described later. At this time, the left and right channels use one 12AX7 and 12AT7 amplification (peripheral resistance slightly adjustment), the channel separation is higher. More tone is more beautiful.
2. Improved Malanti 7 dilerous premium:
The principle is shown in Figure 2. This line is zoomed in two-stage zoom in 12AX7, and then 12au7 cathode follower as a signal buffer. As we all know, the Malangi 7 daring premium is known for its frequent sweetness, but its analysts and high-tech extension is not good. In response to the shortcomings of traditional Malangi 7 daring front, some adjustments have been adjusted on the selection of coupling capacitance capacity and negative feedback loops. Improved Malangi 7 kinds, high, low frequency weight, has a certain extension and strength, but the frequency is better, the courage is most suitable for listening to vocals and strings.
3. Hetian Mao's daring level:
The schematic is shown in Figure 3, and some of the lack of traditional Mantz 7 circuits, the Japanese and Tian Mao improved on the Marant 7 circuit, and the improved circuit referred to as Hetian Mao Circuit. Its main feature is that the SRPP circuit replaces the cathode follower of the Marant 7 circuit. Since the SRPP output stage does not have any voltage amplification, it is only used as a buffer, which is more powerful than the ordinary cathode output, which maintains the high-frequency sweetness of the Mantis 7 line. Its analysis and high and low frequency response is preferred than Ma Lantis 7, and the signal to noise ratio is relatively high, and the tube used by the circuit can also be all done with 12AT7.
4.jadis daring level:
The schematic is shown in Figure 4. The circuit is taken from the French "JADIS JP2000" flagship pre-class classic circuit. It uses 12at7 as a two-stage voltage amplification, and uses 12AT7 as a cathode output. Make the front and rear impedances to match well, and the well increases load capacity. In order to obtain a larger output current and a lower output impedance, the circuit uses the double tripode in parallel, which is one of the points, the sound quality alcohol and transparent, the horses 7 have a strong music, high frequency and low Don also is clearly in Marant 7, which is best suited to enjoy classical music.
Figure 5 is a simple and easy-to-peer-based amplifier voltage regulator. The circuit combines the characteristics of the tube and the premium tube, and the processing requirements of the power transformer are also reduced. High pressure uses a standpiece effect tube, the filament is powered by DC + 12.6V, which can further reduce the noise of the whole machine. In addition to improved the martialilis 7 (the board is gallbladder, gallbladder, motherboard, power supply integration Board double-sided gold-plated design can be used with the power board.
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Produce the amplifier, some enthusiasts specially praised the shed welding. However, the initiator is rich, the success rate is not high, the noise is difficult to handle, and it is hand-made, the output is not suitable, and it is not suitable for mass production. The author believes that the courage should be popular, and the road should be combined with the circuit board assembly. The author used the circuit board made of professional line rice manufacturers, the motherboard is a thickened double-sided gold-plated glass fiberboard, and the power board is a single-sided glass fiberboard, which is convenient for the Movie. The screen is clear, just understand the radio basis knowledge, even if you never assemble the cruise, press the printed board, make sure you have successfully assembled, the finishes of the firmware reached or exceeded Similar products. When the night was deeply inserted, the volume was rotated to the largest, and the ear jam only heard the slight bile duct the bottom thermal noise.
As the saying goes: "Good horse with gold saddle". In the amaten production, the selection of components is also critical. To ensure quality, it is recommended to make a new device. The author uses the kit provided by the manufacturer, the tube is a domestic export product, the resistance is 2W, 3W US resistor, such as Dale resistance. AB carbon resists, etc. The capacitance is 4.7μF / 400V or less ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The transformer has a 100W E-type and R-type two specifications made by the A-grade material to supply enthusiasts. For related components such as sound source selection. Volume control, there are also multiple schemes to choose from, such as relay sound source switching, manual volume control board, top volume control panel (relay switching different resistance), gold-plated input, output terminal, luxury chassis, etc. The machine is assembled, no matter whether the sound quality or appearance is not inferior to some high-plants, change the "artillery" products can't board the overalls of Da Ya.
When assembled, the reference schematic, using high quality solder wire, welding all of the components on the board (including the electronic pipe holder), measuring the power supply, using the multimeter measuring power meal output DC high pressure should be in + 250V Around, the filament voltage should be 12.6V. If the voltage is normal, check that the motherboard tube can be installed, connect the power cord and the input and output sockets. If the audition is normally, you can install all devices into the dilutaneous front cascade. After the whole machine is complete, you can slowly taste the drunk voice of the fever!
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