Symphonies Plus-Signature High-Definition Tubes Line Preamplifier (Version 1.8)

Retired Product


Symphonies Plus-Signature is Audio Experience Level 4 line preamp , it uses one 5687WB at tube input stage and driver stage to driver with one Hasimoto line output transformer construct Class A for each channel. This design is from our Reference grade preamplifier Reference one MK3 tube line preamplifier 


The Symphonies Plus-Signature 's application of a highly efficient solid-state voltage regulator with EZ80 Tube for current regulator and Hasimoto choke in the HVB+ power supply . Also it use the external power supply get highest S/N.




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Volume and Gain uses TKD conductive plastic potentiometer
Input Selector and balanced Controls use SEIDEN (made in Japan)


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MultiCap RTX  coupling caps


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UniCrystal OCC (Ohno Continuous Cast) Copper wire and 
Gold-plated OFC copper wire  for inside interconnect cable.


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Double Hasimoto Choke (made in Japan) at HVB+ power supply.


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Hasimoto line output transformer


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External power supply.

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Main unit : Volume, Gain , Input Selector, Output XLR/RCA Selector .

Power supply : Power On/Of

Output :  One pair XLR Main Output  , Two pair RCA Main Output .

Input : 4 pair RCA input .

Output Impedance :  20 ohms
Recommended load:  150 ohm or greater.

Frequency Response:  20Hz ~ 100kHz ( 20Hz 0dB , 100kHz -1dB) at 2V output.

T.H.D : 0.15%  1kHz at 2V

Input Impedance: 10K ohm XLR , 50K ohm RCA.

Gain: 17.5 dB ( XLR and RCA are same gain )

S/N: >110dB (0.045mv)

Channel Balance: <0.1dB(20Hz ~ 20KHz /max output)

Channel Separation: >96dB(2Hz ~ 20KHz)

Phase Mode : Normal

Max Output : 25V

Line-Stage Tubes : 2 pcs 5687WB , 1pcs EZ80.

main 400mm x 310mm x 150mm (W x D x H) , 
power supply 160mm x 135mm x 60mm (W x D x H).

Weight: Main and power supply total 8.5kg

Power Source: 110-127/220-240V,50/60Hz


Actual Price:  HK$16800

Add extra fee HK$300 for add one pair Balanced (XLR) output.
Add extra fee HK$1800
for exchange the CD input (RCA) to Balanced (XLR) input with Jensen input transformer.
Retired Product



Room1308, 13/F,BLK C,.  
Kai Tak FTY BLDG.   
99-101 King Fuk ST,.   
San Po Kong,   KLN,.
Hong Kong
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