6H14 п + 6H8C + 6P1 daring front-level production, 6H14 п + 6H8C + 6P1 preamplifier
Keywords: 6h14п + 6H8C + 6P1 daring
6H14 п + 6H8C + 6P1 daring front production
The role of preamplifiers in the sound system is lifted. The ideal preconditional amplifier in the heart is: with higher analytical force, capture every note and detail, fully appreciate the wonderful sound source, with a realistic sound field expression, strong music infection; music is natural, beautiful Implied, in line with the aesthetic taste of the Oriental, and revealed a little charming inadvertently. I will have a high-fertilized Idea of the message: Why not make "ideal" preamplifier? What is the use of "olive trees" in the dream, so the author's 6p14п + 6H8C + 6P1 timid stage is like this born.
1. Circular principle 1. Enlarge part Figure 1 is a schematic of most of this unit. The input stage and voltage amplifier is a 6h14 п produced by OTK, which is amplified for a common cathode. 6H14 п Passed in 1962, using glass shell small 9-foot double tripode package, a secondary low μ low internal resistance voltage amplifier, parameters, and parameters. The power supply voltage of this grade is 100VDC, an anode resistance takes 22 kΩ, and the rated power is 1W. Cathode resistance takes 510 Ω, rated power 0.5W. Gate electric retardation takes 220 kΩ, rated power 0.5W. The static current of this grade is 2.6mA, the gate negative pressure is one 1.36V, and the number of open-loop voltage amplifies is 21 times. This grade has current negative feedback and double negative feedback of the overhead voltage negative feedback.
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The voltage amplifier is operated by OTK production 6H8C and Nanjing 6N8P (6H8C), and the cathode is magnified. OTK's 6H8C produced in 1958, Nanjing 6N8P (6H8C) was produced in 1961, the glass shell 8 foot double tripode package, a parameter, and the parameters were attached. The power supply voltage of 260V is 260V, and the anode resistance is 51kΩ, the rated power is 1W. The cathode resistance is 1.5kΩ, the rated power is 0.5 W; the gate electrical resistance is 220kΩ, the rated power is 0.5W. The static current of this grade is still 2.6mA, the gate negative pressure is one 4V, and the opening voltage amplification is 17 times. The current output stage is held by 6p1, using the Dawn 1977 J-class products. This level is a cathode output, no voltage amplifier, but has strong current amplifier. The power supply voltage of 275VDC is 275Vdc, the cathode electric resistance is 270Ω, the rated power is 2W; the cathode load resistance takes 2 kΩ, the rated power is 5W; the gate resistance is 270 kΩ, the rated power is 0.5W. The static current of this grade is 33mA, the gate negative pressure is -9V, and the 5% voltage negative feedback is available. The 6P1 anode is 6.6W. When the cathode output is 6p14, the cathode resistance should take 130 Ω, the rated power 2W, and the rest does not need to be changed. The native cholangi parameters are attached to the table.
2. Power supply section Figure 2 is a schematic diagram of the power supply portion of the unit. The power supply circuit uses a traditional electronic tube rectification CLC filter plus air supply regulator circuit. High-pressure power supply division two: input grade and voltage amplification level shared all the way, output grade, sharing around the left and right channels. Both high voltage transformers use the same type 6 lamp tube radio, the rated power is 50W. Filter inductance L1 and L2 use the same type of Shanghai Radio Twenty-seventh factory rated power of 45W tube radio power transformer primary side instead.
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Table 6H14 п, 6H8C and 6P1 parameters
Parameter \ bile duct
6h14п
6h8c
6p1
Wire voltage / Vac
6.3
6.3
6.3
Wire current / a
0.35
0.6
0.5
Anode voltage / VDC
90
250
250
Anode current / ma
10.5
9
44
Cathode self-bias resistance / Ω
125
Be
Be
Transconduading / (MA / V)
6.8
2.6
4.9
Lagory factor / μ
25
18 ~ 23
196
Internal resistance / kΩ
3.7
7.9
40
Maximum anode power consumption / W
1.5
2.75
12
Maximum gate resistance / MΩ
1
0.5
0.5
The two production process is the same as the sound, noise, beautiful and other problems. If you are not allowed, the principle of the author is meticulous. When the wiring, the input loop should be as close as possible to the rectifier filter circuit, the output circuit, the high potential wire and the low potential wire should not be parallel to the wiring, the shortest wiring, the wire beam angle is not more than 90 °. Combined with a damaged AD-66A to make a host housing, remove the upper cover, which is bare metal structure. On both sides of the casing decoration with a thick 1.8 mm. Most of the electronic pipe chassis with blue sea-produced swan cards 6 lamp tube radio chassis, power supply part of the electronic pipe chassis with Yunnan Yunhua card 6 lamp tube radio chassis. Magnifying the wiring to the power part can reduce interference and improve signal-to-noise ratio. Silk wire is used in German WBT silver-plated 6% tin wire, and the whole machine wire is made of Tulong 1.2mm silver line. The grounded busbar is parallel with two out of the outer skin guide. The input / output RCA terminal adopts imported gold-plated OSL products. The whole machine is made of traditional pair of crafts, and the carriages are plated with a silver-plated bracket, welding holes, and replacement element pins. Tin-plated treatment. The resistance is paired one by one, and the error is controlled within 2%. 2 6p1 is the same product and test pairing. Welding is as follows, think twice. Make sure that each solder joint is sufficiently immersed, the temperature is suitable, the solder joint is bright. The direction of direction of each lead is determined, and the interference is as low as possible, so that the signal to noise ratio is improved. This machine is produced in March. Welding and welding, the welding is easy, it is difficult to break, easy to break the component pin.
Three-component selection 1. Resistance of the resistor machine, the power supply partial current resistor 680Ω / 1W uses domestic big red cannons, 3.9kΩ 5W wire resistance, cathode outputter 2kΩ / 5W wire wind resistance, the rest are green domestic 20th century Carbon film resistance in the 60 ~ 70s. 2. Capacitor capacitors are one of the devices that affect tone in ambigumeric, and the author has a high trick, and the author will also describe one or two. Homemade 6N11SRPP pre-grade filter capacitor selects imported a brand 560uf / 400V small mold electrolysis, music, easy, choose 100UF / 400V, choose domestic days and CDZ-BO 22uf + 22uf / 450V electrolysis, It has become beautiful, lively and beautiful, and the bass is full of hierarchy. The bile duct cathode bypass capacitor also has more influencing details and tone. The author uses ELNA red BP audio coupling special capacitance 100UF / 50V with domestic days and CD15 (47uf / 160V) electrolysis comparative comparison, the BP capacitance is clear and transparent, the dust is not dyed, this is very valuable. CD15 is more beautiful, more detailed, bass is more flexible, and more level.
The quad audon audio system is as follows: rising frequency of the CD66, the comparative predecessor is a homemade 6h1п + 6P14 two-level total yin, the pure grade is self-made 12W × 2 6P14 push FU-7 double tube parallel single The class is enlarged, the speaker is the 101-type 101 type of the signal line for the monster 0.7m, the speaker line double-line tongue: medium and low frequency uses O'奥 克 5 无 无 无 喇 喇 喇,, high frequency is a monster 189 core Oxygen-free copper speaker cable, the inner coil with a monster 189 core aerobic tumpet line. "The story of Guzheng and Tongli))," Tong Li II exclusive love "," The magic "of Yala," Hi-Fi era "," Golden Ear "," Let's see the cloud! ", "Unluled" 1 ~ 4 episodes, "Jiaren Qu", etc. The listening environment is 20m, the room is sound-absorbing treatment, the roof is a lantern ceiling, the cement floor is laid on a rug, and a columns on the carpet are placed on a rug, and the upper floor has a thick fluffy sofa mat. Such a lot of play is clear, and the effect of the entire sound system can be increased by more than 35%. This room should pay attention to fire prevention. The 6H1п + 6P14 pre-designation materials and processes are complex with this machine, and the high-voltage power supply circuit is complicated, and the triode electron tube is used, and the two-stage CLC filtering (the production purpose is to simulate LP tone). The signal-to-noise ratio is difficult to divide, and the volume potentiometer is rotated to the maximum, and the ear is close to the speaker to hear the 嗡嗡 交流. 6H1 II + 6P14 (3 years more time) pre-skilled sound, sound alcohol, bass is natural and powerful, analytical, and sound field performance is general. 6H14 п + 6H8C + 6P1 (used for half a year) preamplifies full-frequency balance, the music is like a small rain, and it is lively and fresh and fresh, a bit of warm sunshine, the slight winds, a bit of cool.
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