Making cheap courage with ordinary components ----- Vacuum Tube Amplifier

I am agreed with the amplifier of semiconductor devices; I have long thought of a line of courage. There are some cheap components in your hands, so you can do one-time in your own hands. Many people say that the switching regulator power is not suitable for the onset, but I use an output voltage of + 130V to use a color TV maintenance switch power supply, change, high pressure sampling resistor, so that the output voltage is + 230V (or + 250V). The rectifier diode of a set of low-pressure (e.g., a + 25V) power supply, the filter capacitor is transferred to the polarity, and the output negative voltage is negatively biased to the 6P1 tube 7 foot after the regulator tube regulation (-12V). The wire is applied to the filament with a lacquered line of 1 mm or more in the magnetic core of the switching transformer (experimentation determination). Due to the heating of the switching tube and switching transformer during operation, it is heat for heat with a small fan with a computer CPU heat dissipation. The amplifier output transformer has a great impact on the sound quality, but because the price of the brand is too high, this machine uses a cheap 25W line transformer for use, the effect is also good. This active only uses two levels to zoom in. One 6n1 is l, the front amplification of the R two channels, and each channel is used in two 6p1 tubes and single-ended output per channel. The advantage of doing this is to increase the output power, reducing the output impedance, and facilitating impedance match between the bile duct and the linear transformer. The circuit is shown in Figure 2. The welder is completed, and the "Qinhuai River" "Qinhuai River" of Cai Qin is played with the machine's Samsung 650V CD machine. Suddenly, the mellow sound of the mellow, the bead circle jade, granular grain crystal, a sweeping of the transistor meshes, and hesitated tone. In addition, the resistance of the large loop negative feedback resistor R is appropriately adjusted (can be triggered with a 50 kΩ potentiometer. After adjusting the same fixed resistance welding with one resistance value, it can be fine tuning to accommodate different Listening requirements. After testing, this resistance is open (no negative feedback), the sound is bright, bright and not hair, is quite transistor amplifier; and adjust to 18KΩ, the sound comes, the sound of sound, and the gallbladder conveys.

Our other product:

Professional lightning protection system for Tower	Professional FM Radio Station Equipment Package	FMUSER FU-1000C 1000W FM Transmitter With USB Audio Input Interface
FMUSER 200W FM Radio Broadcasting Package	Hotel IPTV Solution	FMUSER FSN-1000T V5.0 1KW FM Radio Broadcast Transmitter