VIVALDI V2 Integrated Stereo Valve Tube Amplifier.  

Reference-X grade intergrated amplifier: 

Audio Experience Vivaldi V2 integrated stereo valve tube amplifier is a 845SE 27W x 2 stereo valve tube integrated amplifier
   The amplifier use one 845 power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide Class A 27W adequate output. Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

   The input stage is 6DJ8 tube use AudioCap Theta coupling cap to 6BX7GT driver tube with choke load, The driver tube use AudioCap Theta coupling cap to 6BX7GT cathode follow driver stage, The cathode follow stage is direct coupling to 845 tube work at SET Single Ended Triode mode to driver Hasimoto special grade high quality output transformer , The Hasimoto CUT CORE orient high B output transformer has very low Insertion Loss 0.3dB only.  ( Many SET tube power amplifier in Hi-End audio market , Their have the output transformers is over 2dB Insertion Loss . only about 10% very high price tube amplifier use under 1dB Insertion Loss of output transformer ) . The output transformer has low insertion loss is very important , the best of the best is 0 dB Insertion Loss , The output transformers for High End tube amplifier need under 1dB  Insertion Loss . The Insertion Loss over 1.5dB output transformer will lost many low level music. 

The power supply with two separately HVB+ power supply for power output stage and  input driver stage:
One Hasimoto power transformer with Hasimoto C-core choke and 4 pcs GZ34 rectifier tubes for power output stage..
Other One Hasimoto power transformer for input and driver stage

    This power amplifier case structure and parts arrangement are perfect, the signal path is directly and shortly connected. Great heat dissipation, an anti-shock and anti-RF function to guarantee it works at a very stable status. For sure, this machine is produced by point-to-point methodology. 



vivd2b.jpg (440651 個位元組) vivd2c.jpg (622476 個位元組) vivd2d.jpg (583499 個位元組)  vivd2f.jpg (441688 個位元組)

vivd2e.jpg (508736 個位元組) The speaker connections are Star(Germany)


h845.jpg (1042920 個位元組) Hasimoto special grade CUT CORE orient high B Output Transformer for 845 SET.





Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.5% (2% at 30Hz , 0.5% at 20KHz)
27W per channel , 1kHz total harmonic distortion typically 5%  (rated output)

Controls : Controls : Volume, Input Selector , Low/High gain Selector , Power On/Of

Input : 4 pair RCA line input , 1 pair RCA direct input

Input Impedance : RCA 100K ohm 

Frequency Response:

Test at 1W  20Hz ~ 68kHz  (20Hz -2.5dB, 20kHz  0dB, 68KHz  -3dB)
Test at 27W  20Hz ~ 65kHz  (20Hz -3dB, 20kHz  0dB, 65KHz -3dB)

Input Sensitivity :  0.28V / 27W     

Gain: 34.5dB ( test at 8 ohm )

Output impedance : 4 ohm, 8ohm , 16ohm
Noise: Less than 1.5mV
Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 6DJ8 x2 ,6BX7GT x2, 845 x 2, 5AR4(GZ34) x 4.

Dimension: 430mm x 410mm x 300mm (W x D x H)

Total Weight: 37kg

Power Source: 110-117 or 220-240V,50/60Hz


Actual Price: HK$55,900.




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