300B bile duct with "Dream Ball", has always been the favorite of DIY enthusiasts for many years, and is also the goal of every fake. Her charming is not only the body of Tingting and its delicate sound, more is the word of controversy. There is a saying in the courage audio circulation, that is, the so-called "don't play 300B, it is equal to not playing"; "300B is good, '太 声 声"! " Dreaming to create a coupon, how to avoid 300B "太 监", and always try it with hand. At the beginning of last year, after cautious consideration and multi-party argument, finally set up the determination of 300B courage, and no more, set up 4 sets! The first is to drive as a voltage of 10ж12c in the Soviet, cheap tube. The second unit is completely with the first unit, but the predetermined magnifying pipe is changed to the large shield EF37, and the screen pressure and work point are adjusted appropriately. . The two machines have a satisfactory effect and sound, and some senior enthusiasts are fully affirmed. It is also the advent of the two machines, enhances my confidence in playing 300B, charming tone and concise appearance, which makes me love. Just, there are friends like these two machines. If I ask me, by improving component grade, process, making 300B to further potential, let it be over, Fuhua essence is full? After repeated research, finalize the determination, to meet the cost, cater to the current fever concept, heavy weight 300B. First, the choice of the line is the basis of the determination of the success or failure of the work, and it is also the key to the machine. Therefore, the choice of the line is very important. Do not blindly follow the wind or pursue fashionable, the best to discuss and check the information with the burnt friends before, and finally finalize the theoretical basis. My experience: First, we must first determine your own installation intention. That is, the machine you put out is mainly used to listen, is it mainly used to listen to classical music, symphonic music? Or is it mainly protruding? Wait, according to your own requirements, it is correctly selected. Second, it is necessary to determine the mode of the circuit and then have a targeted choice. The so-called line mode, in the premium, including the magnification of the first level or multi-level? Is it use of a five-level tube or a triode? Is it a small tube? Is the power level selected a single-ended or push-pull? Single tube or parallel? Is the power supply use transistors or use tubes? and many more. The third is to consider hand components and input. Most enthusiasts are considering what kind of machine, what weapon is playing. Then combine its own installed targets, to calculate the required expenditure. Some people will also purchase components according to the selected line, but there is also a problem that considers economic investment in advance. The fourth is to learn from others' successful experience. The establishment of the "Bililiary Art" website, not only to the biliary fan, but also a platform for every day, more enthusiasts provided technical exchanges and access materials. Before you determine the route, you can first check the information first, give priority to mature models and light lines. It is also possible to put the proposed line to the journey of the drum, especially the reflection of the actual installed, in order to promote strength, increase the possibility of success. It is worth noting that there are currently some of the publications and websites, there are many "patchwork" and "theory" line diagrams that have not passed the actual installed test, which should be carefully selected to reduce the walking path and unnecessary losses. For 300B, there are many popular basic lines, but my installed intention is to be as loyal to the original work, use the five-level management level to enlarge 300B, with modern materials, today's craftsmanship to give full play to antique pipes " The antique flavor, that is, with the greatest efforts, to 300B of the original sound, let the "Dream Sound". Refer to the friend's listening trend, plus the first two successful experience, eventually selected 300B of the most basic classic line (see Figure 1), and uses a double mono, according to friends' input, the metader is formulated Purchase program. Second, the selection of the tube: (1) 300B selection: There are dozens of 300b that can be found on the market, and friends who like 300B can be selected according to their own economic conditions and needs. When I installed the first two machines, I selected three 300b: 1, Dawn Eggplant 300BS-B: It is a new type of tube in the Dawn Electronic Pipeline in recent years. Its shape uses a smooth mitigation (eggplant), which reminds people of 300B of ancient history and their mature temperament. The pin is made of imitation porcelain, the anode is made of pure nickel and carbonized screen, and its effect is mainly to reduce the emission of secondary electrons, improve the restoration of the sound; the filament is fixed by the flap hook method to reduce Small input transconductance and capacitance, expand the music performance of the full range. The tube is full of low-frequency, medium frequency powerful, high frequency is clear, is a cost-effective product (see Figure 2). 2. Twilight Eggplant 300BS-C: 300BS-C The main structure and 300BS-B are the same, and the difference is that the anode uses titanium treatment methods, and the two tubes have no fundamental difference. But the individual believes that the tone of 300BS-C is not as good as 300BS-B (see Figure 3) 3, Guo Guang 4300b: This is a modified 300B produced by the original Liuzhou Electronic Pipeline, which has been stopped. The tube is fine, the appearance and the internal structure are similar to the west electric WE300B, hair black screen, gold-plated grid. Personally think that its sound is beautiful, the sound is thick, very atmospheric, cost-effective and stability is superior to the dawn similar tube type (see Figure 4). Through these three 300b use, comprehensive factors, the author focuses on the Gui Guang 4300B, this is a very good quality, very cost-effective. Of course, since it is necessary to make it, pursue the shadow of antique 300b, these have been used in the type of tube, how can I try to taste the Western power? At the beginning, the original version of the five or 1960s is ready to purchase, and the new products are difficult to encounter, and the second-hand is not willing, and it is a high price. After careful consideration, we temporarily bought a reissue version of West Power WE3000B, is 06, the price is about 6,000 yuan. With practical use, tone is still significant, especially in the medium and high frequency band, it is very popular with domestic tubes. (See Figure 5) (2) Pre-procurement tube selection: It can be used as a 300B advance stage driving pipe to be selected, many three-level tubes, five tiger can be competent, provided that it must have sufficient gain. This is because the 300B gate drive voltage is up to 70V, that is, the push tube must provide such a large unimportant output voltage swing to achieve the best. Such conditions are more convenient and concise with a triode using a five-level tube. Moreover, I prefer a special tone of the five-level tube (I feel more than the triode), so the first 300b courage, the first-grade pipe is the 10 ж12c of the original Soviet Union, the second product is The large shield EF37A, the two tube lines are basically, just to give full play to the performance of EF37A, appropriately improve its screen pressure, and increase the voltage of inexger poles to 100V. Real audition, the two machines have a characteristic, and the director is long. Use 10 ж12c as a driving, the sound is heavy, the sound field is large, the disadvantage is that the music details are slightly rough, and the enthusiasts who like symphony can be considered; and the EF37A pipes, the calf is more clear, but the details are clearer, but the low frequency is more clear The former is slightly poor, suitable for the burning friends who hit the strings. In addition, the EF37A work points are not good, and their sound is somewhat whim, and other enthusiasts who play this tube do not know if they have the same feelings. At the same time, I tried the BMW 6J7GT tube and the British BMW 6J7GT tube and the British BMW 6J7 gourd tube on the second machine. I didn't have the adjustment situation (of course, directly change the tube audition method, I can only do this), BMW 6J7GT pipes are best in high frequency detail, tone, etc. (see Figure 6). In this heavy weight 300B machine, there is no need to ask, the foreigner push management will definitely choose the WE310A of the West, I am happy that we not only bought the second-hand and new We310a, but also actually found a pair There are 9 finished products. The fine network Western Western WE310A produced in the 1950s cannot say that for this machine, it is indeed a brocade (see Figure 7-1, Figure 7-2). (3) Tolerance selection: Total five tubes: RCA's 5U4G (see Figure 8), Dawn 274B, Guizu's 274B, 53KU in the UK (see Figure 9), also purchased a new new original box The British Herobs 83 mercury tube, just because the holder is not uncommon, I have not appreciated the sound of the west electricity 300b under the rectification of the water supply tube. I will try again later. After repeated audition, the decision is still preferred to use the 274b of Guizu, the heavy tube, it is confident, especially the big gourd appearance like the West, WE300B, is really like it. What needs to be explained here is that the original purchase of WE274B, but has not been found (it is said to be more than 7,000 yuan), and only the use of Gu Guang 274B, which seems to be unsatisfied with the price from the price. However, it has passed the budgetary expenditure, when looking to the original antique Western WE300B, it will let the west and electricity WE274B of the supporting west74b on this position, and then introduce it to Guangda's burnt friends. hehe. See the next page next page
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