And there is one type preamplifier, we call it as tube buffer that is no gain, input and output signals 1 to 1, Its role and advantages are, it can greatly reduce the digital taste and transistor sound when connected between VCD, CD, DVD, CD-ROM and other digital audio amplifier, so that the entire sound system has sweet natural tube taste
Tube Buffer from IWISTAO HIFI from IWISTAO HIFI AUDIO on Vimeo.