![]() ![]() Preamp only profiles are fine for instances where you intend to use a valve guitar power amp (which effectively takes over from the power amp section of the profiled amp) or for very aggressive metal style tones where that more fizzy edgy sound is desired. ![]() This is because the effect of the power amp on the sound still makes such a huge contribution to the overall sound of the amp.Īnyway, sorry about the storytelling style,(are you sitting comfortably) don't know what came over me, but hope that gives you an idea of the differences. The amp needs the power amp contribution to round off the edges and 'bolden' the sound.Īs amp design has progressed, and indeed as new generations of guitarists have been brought up with these newer designs, more modern amps have been developed to obtain more of their signature sound from the preamp, but even now most amps need to be turned up to a particular volume before they start to sound good. Problem is, preamp distortion is only part of the equation and tends to be fizzy mushed and a bit thin. In effect the master volume turns down the power amp while maintaining the 'wound up' preamp giving part of the traditional rock sound at much more manageable levels. This was often augmented by the new fangled fuzz boxes, but thats a different type of distortion altogether.Īnyway the only problem with this overdriven power amp rock sound was the really loud volumes required to achieve it.Ĭunning amp designers realised that a similar effect could be achieved at much lower volume by overdriving the preamp only. The preamp traditionally is used to shape and eq the sound, the power amp to amplify it to performance levels.īack in the 60s guitarists realised that by turning their amps up very loud, the preamp and power amp distorted, giving that traditional late 60s and early 70s rock guitar sound. The preamp and power amp are the 2 distinct sections of amplifiers. ![]()
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