Since the introduction of the electronic tube bile taste correction circuit designed by the author, it has been favored by many DIY enthusiasts. The enthusiasts who use this circuit say that the sound quality of the sound has improved significantly.
Audiophiles now have digital record players (CDs, VCDs, DVDs) and power amplifiers. If you listen for a long time, you will feel upset. In fact, this is digital sounds! ! Then we will eliminate it! ! Give us sweet music! The method is very simple: add a tube bile sound circuit between the digital record player and the power amplifier, or you can add it to the player (the analog signal after the audio decoding is connected to the tube bile sound circuit as an I / V circuit, and then connect Back to the output, it is easy to find the dual op amp connected to the output of the phono. The dual op amp can be canceled or retained. If it is retained, the signal input of the tube circuit with a louder sound is taken from the dual op amp. Earlier, so that you can have two output options). Several domestic high-end CD player manufacturers adopt this method. Of course, the price is not cheap, from more than two thousand to more than ten thousand yuan.
The charm of the tube: the tube amplifier is matched with the digital sound source (such as CD, VCD, DVD, etc.), dilutes or eliminates the digital sound with the bile taste, so that the sound becomes warm, and is rich in the sense of music and air, thus obtaining sweet and soft music Taste (that is, guts). If you use a general transistor amplifier to play sound, you will feel harsh and unpleasant to listen to, because there is digital sound, so-called transistor sound (stone smell).
The single tube cathode output circuit was selected for the louder circuit of the tube bile taste (see figure): the circuit comes from the output stage of the pre-stage of the first-generation Mingqi, the prestigious Marantz 7 and the Maijingtu C-22. The cathode output circuit has the characteristics of low output impedance, wide frequency response, and low distortion, and has beautiful sound, good texture, good music, and low noise.
The author has recently redesigned the tube bile taste correction circuit to improve its performance! The improved design is as follows:
â‘ First, the arrangement of the circuit board and components is rearranged, the components are arranged neatly, horizontal and vertical lines, left and right symmetry, such a product gives people the impression that it is beautiful, exquisite, and it will be attractive at first sight!
② Pay more attention to the arrangement of the spacing between components. The area of ​​the circuit board has been reduced from the original 9╳20cm to 8.5╳15.5cm. With the exquisite component arrangement, the product is more compact and more convenient for DIY enthusiasts to upgrade the machine. Let the original limited space amplifier easily fit her petite! If the amplifier can't fit her, it's not difficult to make a shell yourself.
â‘¢ The coupling Capacitor has been changed, and the original 4 RIFA capacitors of 2uF have been changed to 8 red WIMA MKP capacitors of 1uF for parallel use. In this way, high-frequency signals can pass through the coupling capacitor more easily and the sound can be clearer.
â‘£, the delay soft start system has been improved, the positive and negative power supply delay is changed from the original unified A970: positive power delay A970 (A733 is also available), negative power delay C2240 (C945 is also used) can). The improved schematic diagram is shown below.
⑤ The circuit board at the bottom of the radiator of the tube filament DC voltage stabilizing circuit is drilled with a number of ventilation holes to make the radiator more normal when the voltage stabilizing circuit is working, and to ensure the stability of the voltage stabilizing circuit.
Component selection: ①The tube uses 6N3 or 5670. The author feels that 5670 is slightly better, but 5670 is more difficult to buy, and 6N3 also has a lot of prices, both new and old (new refers to the 70s and 80s produced and not Used, old refers to second-hand goods removed from the previous tube radio): the old ten yuan to twenty yuan, the new around 40 yuan. 5670 There is nothing new, I bought second-hand products made in the United States; ②The circuit board author uses silver-plated and printed blue oil to upgrade, arrange the components neatly, horizontal and vertical lines, left and right symmetry; ③T3 radiator To be large, the circuit board at the bottom of the radiator is drilled with a number of ventilation holes to facilitate heat dissipation; ④ electrolytic capacitors use Japanese ELNA supplement capacitors; ⑤ 0.1u use Philips blue MKP capacitors; ⑥ resistors use American DALE 1 / 2W; the selection of R1, R2 resistance is the most critical (the selection is the best, the taste is the best, the layout is not described in detail here, if you want to know more, visit the following website: http: //); ⑦ There are 8 input and output coupling capacitors for the channel. The selection of these 8 capacitors is very important. Different brands have different tones. I use the red WIMA MKP capacitors.
Audition process: The sound source adopts Shengya S3 HDCD machine, and uses a power filter. The front stage uses ME-128 class A prestage, the rear stage uses ME-308 pure DC current negative feedback amplifier, and the speaker is made by Hivi speakers. Bookshelf box. Playing Hugo CD "Jubilee", after listening to the comparison, I found that the sense of hierarchy is clear and distinct, the sense of space is rich, the high frequency is delicate, the middle frequency is sweet, and the low frequency is natural. The author went through the same test sounds several times and confirmed the conclusion: the sound of the tube bile taste sound circuit will get a clear and distinct layered sense, a rich sense of space, a delicate high frequency, a natural low frequency, a sweet mid-frequency !
Install the tube bile taste sound circuit between the sound source and the pre-stage to get a charming bile taste. Immediately: make the low frequency strength, music details and sound field positioning have obvious upgrade effects. Solve the shortcomings of the transistor power amplifier; it can filter out the residual digital signal of the audio source and make the music signal more pure. The large dynamics of the tube and the characteristics of soft distortion can make the tone softer! The rapid upgrade method with less investment will surprise you! When using it, just connect a 30-50W transformer, which can be installed in the CD player / VCD player, or in the power amplifier. If you have a high level of craftsmanship, you can also make a beautiful shell for it! !
The cost is only more than one hundred yuan (of course, if you use a SOLEN large S capacitor of tens of yuan and a resistor of five or six yuan, then you will get two or three hundred yuan), you can get a charming bold taste. Upgrade method. To this end, the author writes a close-up article for the imitation of DIY enthusiasts, but refuses free commercial imitation. In this paper, the tube gallbladder circuit is named SP-10 tube gallbladder circuit. 
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