The GT-ECC83S preamp tube represents the classic "Euro" type tube, with medium to high gain and a linear frequency response. The GT-ECC83S gives you a very clear, even tone with good bass character. This tube type was long used as standard equipment in Marshall and Vox amplifiers. For those who change first stage gain preamp tubes to change the character of their amps (remember, this can be done in less than a minute without tools, adjustments, or a "tech"), the GT-ECC83S is definitely an essential.
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