science

Sansui AU-11000

Sansui AU-11000 is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sansui AU-11000 rather than just read about it. In short: The Sansui AU-11000 is a home audio integrated amplifier built by Japanese audio electronics manufacturer Sansui during the mid 1970s. The amplifier is known across the audiophile community for its high-output power and low Total harmonic distortion (THD).

Key takeaways

Sansui AU-11000 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sansui AU-11000 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sansui AU-11000 from memory before moving on to harder problems.

Reference excerpt

The Sansui AU-11000 is a home audio integrated amplifier built by Japanese audio electronics manufacturer Sansui during the mid 1970s. The amplifier is known across the audiophile community for its high-output power and low Total harmonic distortion (THD). The AU-11000 has an output power of 110 watts-per-channel, and was one of the earliest home audio amplifiers to use multiple transistors per channel using a "Push-Pull" method to add more amplification power. The AU-11000 uses independent circuitry in the amplification process, in such a way that, each individual channel has its own circuits. This means everything from the power supply to the bias control board all have 2 identical and independent circuits per channel to separate the 2 stereo channels. This also minimizes the Total Harmonic Distortion within the amplifier down to 0.08%. The AU-11000 has its own power protection built into the amplifier. When the power switch is turned to the "ON" position, the power light comes on as green for a second, and turns red for a few seconds until the power protection circuitry has confirmed it is safe to power-up. Once it has finished, the power light turns and remains green until the amplifier is turned off. The AU-11000 also has its own block diagram printed on the upper-front casing. Sansui designed the AU-11000 with the input, output and speaker terminals on the sides of the unit. The rear of the unit has the power cord and outlets only. The AU-11000 has features such as a logarithmic volume control, a 3-position level-set muting, a -20db mute switch, 3-position high & low filters, 3-Band Linear Bass/Midrange/Treble controls, 3 optional frequency settings for Bass & Treble controls, 3-position Tone Selection, A & B Speakers, Tape Input/Output control, 5-position mono-stereo selector switch, Tuner input, 2 Auxiliary inputs, 2 phono inputs, 2 rear 'always on' power outlets and 1 switched power outlet that is controlled by the units main power switch. There is an XLR input for Tape 2, and a spring-loaded ground connection plug. There are a few variations of the Sansui AU-11000. Many units share some of the same internal components as the less-powerful AU-9900, such as the Bias Board [F-2580] and the Power Supply Board [F-2566], though the AU-11000 has much larger power capacitors. Some units have an 'A' at the end of the model number (AU-11000A), indicating it has 120 Watts-per-channel and a linear volume control.

There is a lot of discussion among the home audio community about how to properly set the DC Offset & Current Bias within the amplifier. This is not something for the average do-it-yourself'er or handyman, and should be performed by a qualified technician. AU-11000's with the F-2580 bias board can be adjusted using the service manual. AU-11000's with the F-2583 bias board have VR01 & VR03 switched within the circuit. VR02 & VR04 and also switched respectively. This means that the DC Offset & Current Bias trim locations are switched with one-another on the F-2583, compared to the F-2580. The Service Manual depicts proper adjustments of the F-2580 only. The picture on the right shows the proper illustration for the F-2583. The AU-11000 uses 8 TO-3 style power-output transistors, 4 per channel. 2 of the 4 are Sanken 2SC1116 [NPN] transistors, and the other 2 are Sanken 2SA747 [PNP] transistors. Two of the same transistors are paired together onto a single Power Transistor Circuit [F-2581], and are paired with an identical circuit using the 2 different Power Transistors. The 2 circuits function together to power the respective channel using a "Push-Pull" method to create the 110 Watts per Channel. The 2 circuits make up each power amplifier per channel. This makes a total of 8 power-output transistors within the amplifier. Each amplifier channel has a temperature sensor built-in as part of the power protection circuitry. If the amplifier is too hot, the power protection circuitry will not allow the amplifier to power on. The power protection circuit has (4) 2Amp fuses. There are (4) 7Amp fuses on the power supply board [F-2566]. Since the power supply board is actually 2 identical power supplies (1 per channel), there are 2 fuses per individual power supply. There is a ground screw inside the front-bezel which links the ground to several of the AU-11000's circuit boards. This is often overlooked when checking the ground connections.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sansui AU-11000

Start with the simplest possible case. Write down what Sansui AU-11000 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sansui AU-11000 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sansui AU-11000 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sansui AU-11000

In research: Sansui AU-11000 appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sansui AU-11000 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sansui AU-11000 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Audio amplifiers, so understanding it makes those chapters shorter.
In everyday life: Look for Sansui AU-11000 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sansui AU-11000 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sansui AU-11000 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sansui AU-11000 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sansui AU-11000 in simple terms?

Why does Sansui AU-11000 matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sansui AU-11000?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sansui AU-11000.