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Pre90 adopts full balanced structure. The output can be balanced, sin- gle- ended, balanced + single- ended. With the balanced + single-ended two-way input, in addition to the normal preamplifier usetage Pre90 can be used for "balanced to sin- gle- ended" or“single -ended to balanced" signal conversion. With the help of maximum gain +16 dB, Pre90 could easily amplify the weak input signal to acceptable level of next amplifier. It is worth men- tioning that since the noise is as low as 0.3uVrms, this step does not bring in audible noise while amplifying the signal.