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127516 u
30-11-2009 20:58 GMT+01 sat :
Nemas dobru informaciju.
Samo mali Fenderi od 5W (npr. Vibrochamp), su klase A, kao i gotovo sva lampaska pojacala male vataze. Svi ostali Fenderi, kao i Marshali i gro pojacala su klase A/B. Od velikih, klasa A je samo VOX AC30 (odatle mu i ime VOX A-Class 30W).
Velika pojacala nikad nisu klase A zbog jednog glavnog, tehnickog razloga a to je da su sklopovi u A klasi u elektricnom smislu veoma neefikasni jer vuku punu snagu pojacanja cak i kad nema ulaznog signala i stoga treba im nesrazmerno veliko napajanje sto povlaci mnogo problema.
Evo ti par navoda koji to potvrdjuju:
1.----------
Class AB amps are the most common types of tube amp (Fender, Marshall) and they operate in Class A for part of their output and turn on additional current for the remainder of their output. Class AB amps feel ‘slower’ to the player as there is a time lag between the application of the input signal and when the devices are turned on to let current flow to the speakers. They also need higher power ratings to produce the same volume as a Class A unit, use lower voltages, and tend to be a bit more stable and less in need of repair work. Fender Twin Reverbs are a classic example of a Class AB amp and playing one next to a Vox or other Class A amp will start to give an applicable understanding of the ‘hands-on’ differences in the two designs
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In a class A/B circuit, although the tubes have voltage applied to them so they are always powered and lit up, the tubes aren’t really on until signal is applied to the tubes’ input, which is called the grid. In this circuit, signal is applied to the tubes when you play. Most amps that we know and love, like Marshalls, Fenders, Ampegs and Hiwatts, Kendricks, to name a few, utilize this type of circuit.
Mozda se i ja nisam izrazio najbolje, tacnije bi bilo da sam rekao da pojacalja A klase daju boutique zvuk, mada ni British nije pogresno.
'Rđavom gitaristi i žica smeta.
