XiangSheng 728A tube Preamp Shigeru Wada Circuit Pre-amplifier
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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 Impedance：600 ohm
Total Hamonic Distortion： less than 0.01%
Frequeney Responses： 10Hz-30KHz
Signal to Noise Ratio： 90dB
Input Jack： 4 groups
Output Jack：2 groups
Supply Votage： AC100V-AC240V available 60Hz/50Hz
Size: 430mm(Width )×90mm(Height )×290mm(Depth )
Vacuum tubes: 12AT7×2、12AU7×2、6Z4×2
Working environment: Temperature:5℃―40℃
Weight：about 8.5 Kg
Gross weight: 10kg
WITHOUT key to Adjust bass and treble Version: