Massa random-frågor (el, digitalt ljud, amps, vintage-mixer...)

[Martin]

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Redigerat 1 januari 2014 av Martin

[Electricwizard]

7. för den som inget frågar får inget veta 😛 (säger jag med en klämcheck röst)

[Martin]

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Redigerat 2 januari 2014 av Martin

[CHAE]

Bra frågor. Jag hittade det här ang. class A, B och AB-stärkare på Ultimate Guitar;

[...] In essence, an amplifier’s class is based upon how much of the original signal is used through the circuit. More often than not, the percentage used is notated as an angular degree, or the “angle of flow”. Therefore, È = 360° means that the full signal is used, and È = 180° would be half of the signal. The angle of flow is also closely related to the efficiency of the amplifier. Let’s take a look at each individual class:

Class A

In this form of amplifier, 100% (È = 360°) of the original signal is used throughout the whole circuit. The result is an upscale version of the original signal, unclipped and effectively amplified to a more intense, usable signal. These amplifiers are very energy inefficient however; because the amplifying element is biased to constantly be conductive, power is drawn from the source even when no signal is being input. In layman’s terms, the amplifier is drawing power even when you’re not playing.

Up to one Watt is dissipated for every Watt used to amplify the signal. This 1:1 ratio means that as much energy is wasted as is used when managing the linear signal. To many players, this inefficiency is worth it; the main reason for a Class A’s linear signal function is the use of tubes. Tubes have asymmetrical output, resulting in even and odd-numbered harmonics. While this is chalked up to opinion, many players agree that tubes producing those forms of complex harmonics result in a higher-quality sound.

Class B

In these amplifiers, only half of the signal (È = 180°) is used, resulting in a lot more clipping (distortion) but a more efficient system. The system only operated half the time, processing half of the signal, so it naturally uses less power. It is unusual, however, to find amplifiers using single Class B elements due to unusual output signal, and are more often found in personal radios and battery-operated devices than . Instead, they are quite often paired with with a matching push-pull element, resulting in a Class AB system.

Class AB

Relying on the use of two Class B units, a Class AB system is a pair of complementary push-pull devices, each amplifying ~55% (È = 198°) of the original signal and combining them afterwards, resulting in a full signal. The reason why each device takes more than 50% of the signal is to ensure that the signals crossover and match up, and no device is completely shut off at any time. However, Class AB amplifiers are still extremely efficient. There is the risk of crossover distortion, where the mismatched signal ends clip once combined; at most performance volumes, the distortion is not easily noticed and a the power efficiency of the amplifier is considered to be worth it.

På fråga 7 svarar jag; "fuck knows" men håller med Electrowizard ☺️

Vänligen,

CHAE

[Martin]

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Redigerat 2 januari 2014 av Martin

[CHAE]

CHAE, tack tusen tack för infon. Nu klarna det om amps... 🙂 Det roliga är att jag har cirka massvis med såna här frågor i mitt huvud just nu.... Tusen frågor och 0 svar 😄 Nu fick jag ett! TACK.

Faktum är att jag själv ställde mig samma fråga ang. gitarrstärkare för några år sedan och hittade det där. Det gjorde i alla fall mig klokare.

Vänligen,

CHAE

[Martin]

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Redigerat 2 januari 2014 av Martin