Zheng Weidong "High-fidelity Audio" 1996-06
In the past, most of the preambles were made of printed circuit boards, so it was better to make convenient to make a studio when the change line was changed, and the printed circuit board was also changed. The author introduces some electronic waste to make electronic pipe pre-tube pre-tube, interested producers can easily change the three lines of M7, JadisJP-80 and SRPP, try to match different back-level and speakers to fit their ear Hobbies, choose the fierce front level for you to listen to you, because everyone's hobbies are different, some people like to be thick, some people like transparent, in short, the three electronic tubes have their own different sketches and tones, are cheap Material beauty. The SRPP circuit is called a shunt adjustment push-pull circuit. Its distortion, linearity, amplification, dynamic and low output impedance are better than the general Actian triode amplifier, opposite to many other electronic pipeline design, SRPP circuitry The distortion rate decreases with the increase in frequency.
Part selection
Now talk about how to choose the right electronic waste to do the pre-tube prevention. In terms of the chassis, you can use the power box of Apple's backplane and the power box of the machine, because they are made of aluminum, it is easy to process into a whole aluminum chassis, with two to three older computers, with saw saw good aluminum plates The upper screw can cause an excellent chassis for an electronic tube, and of course the reader can buy a finished chassis. In terms of power transformers, I have several ways to get a suitable power transformer from the waste: heavy. High and low voltage power supplies each use of independent transformers, can choose two identical in transformers of recorders, and the primary secondary independently wound (subsequent unblocked primary winding) O first carefully remove the silicone steel sheet, take out the line frame Due to the two layers of the primary level, the low pressure line can be removed, and then the plastic frame of this layer is cut into the plastic frame, re-press the pad, which forms a new 220-220V isolation transformer. As for the 6.3V filament group, the transformer of the other 20W and more than 12 to 15V is rectified. 2. From the old electronic control open recording seat, remove the power transformer, use it directly, where the Sony card is easier to find, it has inside and outside the shielded steel sheet, which can reduce noise. 3. Find a 2F10V / 100V anti-pressure transformer to do multiplier. I have used the above three ways, mainly to see what part of your hand is. In terms of capacitors, there are many brand capacitors in the old TV in Germany, there are WiMamkp-10, MKS-4, which can be connected to the capacitor, I send a Fit capacitance in the Royal Satuce than WINM better than WINM, its 220 ~ / 400V electrolytic capacitance is also good, almost all good capacitors for making the courage can be found in the Television in Germany, and many of these TVs do not. As for the resistance, a regulated transistor, a fast rectifier, there are many in the power and displays of the old computer. I think the most important thing in front of the electronic pipe is gallbladder. After ready for the above parts, you can buy some famous names, which will be with the reader. I have 12AX7 \GE and RCA's 12au and Big Shield's F. C. C88, can have different tones in the above three kinds of timid, and the additional 6nllj is also very sound. It is now speculating to more than 30 yuan, and I only sell a dollar a few years ago. The volume button is the easiest to use ALPS. I use the 24-throwing 2 knife switch removed by the old instrument with a 1% resistance to solder itself. The resistance form is the value given by Mr. Xu Yisheng. If you can't find a 24-throw switch, 16 throwing 2 knives are also very good, and you can change the value of the resistor. It is also possible to use 11 throw 2 knives. However, it is best to add a 2-handed switch to help, it is troublesome, but the balance of the resistor may be better than Alps, and the RCA socket is usually casual. Because I use the parts of the rear, it is only more than 100 yuan, so the main parts are German. More than a lot of parts, the sound is very satisfied. Be
Wrap the part selection and introduce it to the shed production. The power supply section and the magnification are separated by a piece of aluminum plate and a heat sink. This is similar to the split power supply, which is convenient for the use of a more split power to secure the power transformer \ filter capacitor screws in the chassis. LM317, TIP60, 7805 is fixed to the heat sink. An additional capacitance resistance is soldered between them. The entire power supply is very sturdy, and most of them are connected by a thick steel wire in three electronic pedestal, and the resistance capacitor is also very stable between the electron holder and the ground. Nowadays, there are many daring premiums, which are very convenient, especially the change lines.
The production of tube is more easy, the wiring is correct, must be successful, the main pay attention to the problem, as for the parts, the manufacturer can change the capacitance of different brands and different tones, more than the pre-class precedent, produce it, Do not have to buy a price of the price, there is no second-hand market due to self-cultivation. There is no one to play, so it is good to make a low price part.
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