XiangSheng 728A BK Vacuum Tube Pre-Amplifier Preamp Shigeru Wada Japan circuit U
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The pre-amplifier improved based on famous Wada Shigeho's Style Electric circuit,which was
Introduced by Wada Shigeho in the early 1960s and gave an excellent performance.
Regarding the Wada Shigeho's Style Electric circuit, it not only still keep the good
features of Marantz7, meanwhile it have superrior features in Dynamic, High/lLow Frequency
Response, Resolution and Signal to Noise Ratio as compared to Marantz7. But apart from
above features, it’s also not inferior to Marantz7 in Sound stage and airy feeling.
Adopt 4pcs paper in oil capacitors and German WIMA capacitors for coupling effect, make the
sound warm and delicate.
Output Impedanceï¼600 ohm
Total Hamonic Distortionï¼ less than 0.01%
Frequeney Responsesï¼ 10Hz-30KHz
Signal to Noise Ratioï¼ 90dB
Input Jackï¼ 4 groups
Output Jackï¼2 groups
Supply Votageï¼ AC100V-AC240V available 60Hz/50Hz
Size: 430mm(Width )×90mm(Height )×290mm(Depth )
Vacuum tubes: 12AT7×2ã12AU7×2ã6Z4×2
Working environment: Temperature:5ââ40â
Weightï¼about 8.5 Kg
Gross weight: 10kg
WITHOUT key to Adjust bass and treble Version: