アンプを作る前の一番 必要な作業 The most necessary work before making an amplifier
真空管アンプを製作する Manufacture Tube Ampllifier
Facebook Meta はこのページを悪質 有害 ページと定義しています。それが理解出来ません、METAの商業的なやりすぎ行為に絶対反対です。METAは日本で金融業や高利貸しもしているのです。目的外違犯してないか
と思います。自分の力で集めたのではない資金で金持ちとなったMETAはやり過ぎ行為が目立っています。これは絶対許す事が出来ません。皆さんもお考え下さい。更に優良サイトを悪と定義してポルノサイトを優遇する
思考は何とも考えさせらます。このような組織の敗退を望んでいます。
Facebook Meta defines this page as a malicious and harmful page.
I don't understand that, and I am absolutely against META's excessive commercial behavior. META also operates a financial and loan sharking business in Japan.
I wonder if they are violating their purpose. META, which got rich with funds that they did not raise with their own efforts, is conspicuous for their excessive behavior.
This is absolutely unforgivable.
I hope everyone thinks about this too. Furthermore, the idea of defining good sites as evil and favoring porn sites is very thought-provoking.
I hope to see the defeat of such an organization.
To make a tube amp, you probably need the same idea with any amp. It is necessary to carefully build the ground line with any amplifier,
especially when making a low frequency amplifier.
The same idea can be applied to printed circuit boards You will need it. Depending on the quality of this ground line,
it can be a good amp or a bad amp that is easy to transmit. In the case of a tube amp, this ground line is called the "earth bus". First before making the circuit
I have a plan, but generally speaking, what is needed in the design of a stereo amplifier is to stretch the left and right ground buses inside the chassis like a fish bone.
The position of the input circuit and output circuit, the position of the power transformer, etc. are important.
Since the power transformer has a core, positioning so that the core of the output transformer and the magnetic field lines do not enter the same loop is the basis of amplifier production,
and the position of the high-end transformer and power transformer installed side by side in a beautiful chassis. Depending on
The hum sound is picked up and the life as an amplifier ends with that. Electricity does not lie, so first position it on the chassis etc. and determine the position of the transformer.
The most necessary items for making an amplifier It will be. These positions determine the life of the amplifier.
Whether it will be a good amplifier or a high-end junk amplifier will be decided by this work. This page has existed since the launch of this site,
but it seems that those who missed this item became an noisy amplifier. It's a basic idea. //traduce by Google
So what do you do first?
1) Please prepare a digital tester or an oscilloscope that can measure alternating current. The tester is connected to the output side of the output transformer.
2) Power transformer and output transformer
3) Connect the AC cord to the power transformer. The image will look like the one below.
This positioning will determine whether it will be a good amp or a bad amp. The positioning of the transformer cannot be determined by unstable factors such as coolness,
and hum noise will occur due to the influence of the magnetic field lines.
Recently, vacuum tube amplifiers that dislike these and use DC / DC converters have come out, but the sound may be slightly hardened or good analog sound may not be produced.
Some people say that tube amps should have some hum.
We recommend that you use the old method to make an amplifier using a transformer.
Position the transformer as shown in the image. Attach an AC cord to the power transformer and connect it to AC.
Be careful not to get an electric shock. In some cases, you will die. After that, connect an AC tester to the output transformer.
For the range of the tester, prepare a tester that can measure mV. Alternatively, an oscilloscope is fine, but a tester is sufficient. Please note that it is an AC range.
With the transformer positioned, attach a tester to the secondary side of the output transformer, that is, the output side, and measure the voltage.
Fix the transformer at the point where the AC voltage decreases depending on the position of the transformer.
Determine the position of your favorite configuration with those positions.
The amplifier will be manufactured on the chassis where the determined position becomes the amplifier as it is.
The position depends on your taster and the shape of the transformer. We recommend that you test it many times.
Fixed Transformer position
almost fixed all of transformer on chassic // KT88 Single Ended Amplifier case
The earth bus is called the Mother line in Japanese. It's a general term. It is called the earth bus. EARTH BOSEN we call it's.any one knows.
For this wire he uses nickel-plated copper wire with a diameter of 1 mm to 2 mm. Any thick bare wire will do, but we recommend nickel-plated wire, which is resistant to corrosion.
If this lead wire is stereo in the chassis, it is a normal method to stretch it symmetrically on the left and right. Place it insulated from the chassis like a fish bone.
It is necessary to stretch it with an insulating plate, being careful not to touch the chassis. Completely insulate from the chassis.
The place where this ground bus is connected to the chassis is called the ground point,
but the place is fixed. This method can be used with both Mark Levinson and Sony high-end amplifiers.
The earth point is the same place in Jefforland's ultra-luxury amplifier. It is decided at one point of the input circuit on the circuit. Even with a large amp,
there is a red screw on the back of the amp
There is one point grounded there. If this screw is loosened, hum will appear and the amplifier will become unstable.
Where is this place? It can be 1 point ground for tube amps or 2 point ground for him. The location is generally the terminal of the input circuit.
In my case, I fastened a screw to the chassis near the ground of the RCA terminal of the input circuit, and connected the screw to the ground bus with a thick wire.
In the case of a tube amp, it is difficult, and it is grounded near the control grid of the input circuit. Or, in some cases,
a ground bus to the ground terminal of the power transformer.
Connect. One-point ground is preferable, but in some cases I use two-point ground. There are two points, an input circuit and a power transformer. Earth bus
Be sure not to be parallel to the core of the power transformer. If you put parallel lines on the core surface, noise may come out from there. As much as possible around the power transformer
Avoid laying a thick wire with a wire diameter. This is because the earth bus may act as an antenna and pick up a subtle hum.
The dirtyer the wiring of an amplifier, the better the sound.
A well-organized amplifier is often noisy and not very good. Do not place a straight ground wire around the power transformer.
Traduce by Google
Bus line wire 2 mm nickel plated wire
Bus line
asignement of BUS line by 300B Tim William Amplifier
If the ground bus is firmly wired, almost no hum noise will occur. There is a method of grounding directly to the chassis called "solid ground" used for high frequencies.
This method is for transmitters, etc.
I will use it. The ground bus system cannot be used for transmitters and high frequency amplifiers, and the solid ground system cannot be used for low frequency amplification.
There are two types of grounding methods.
In the case of the earth bus, there is a method like a fish skeleton or a star method. For 1-point ground, be sure to connect the ground bus to the chassis at one input point.
Grounding here and there is not a good thing.
One input is sufficient, but in some cases grounding the metal chassis at the ground point of the power transformer is a common grounding method,
and this alone will eliminate any hum. Of course,
it is a generally known method that hum is completely eliminated by adjusting the direction of the core of the power transformer and the method of the core of the output transformer.
Cumbersome jungle wiring produces the best results. This is from experience. Wiring that is neat and tidy has a lot of stray capacitance and creates a loop, so it may become a dust amplifier.
That's why a well-made amplifier oscillates easily and the sound is bad.
Jungle wiring is difficult to oscillate because the elements are not parallel and intersect. An amplifier with dirty wiring will produce a beautiful sound.
As an example, it is a general idea that a prototype has a good sound and a mass-produced machine has a bad sound.
It is thought from such achievements that the amplifiers made by amateurs are good and the sound of amplifiers made on boards is bad.
Luxman MB300B inside Black wire is Ground wire アース母線は黒いワイヤー
MB300B でハムが出る場合はプラスチック枠で固定されているコンデンサーが容量抜けが出ています。何度か経験しています。良質な電解コンデンサーの新品と交換して下さい。
If you hear hum from the MB300B, it is because the capacitor fixed in the plastic frame has lost capacitance.
I have experienced this several times. Replace it with a new, high-quality electrolytic capacitor.