The Real grade:
 VIVALDI  Integrated Stereo Valve Tube Amplifier.


Audio Experience Vivaldi integrated stereo valve tube amplifier is a 211SE 25W x 2 Stereo Valve Tube Amplifier.
   The amplifier use one 211 power tubes work at SET Single Ended Triode configuration status to provide 25W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

   The input stage is 5687WB tube use AudioCap Theta coupling cap to 5687WB driver tube, The driver tube use Cardas coupling cap to 6189A cathode follow driver stage, The cathode follow stage is direct coupling to 211 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. 



viv2.jpg (559431 個位元組) viv1.jpg (492283 個位元組) viv3.jpg (491895 個位元組) viv5.jpg (573347 個位元組) viv6.jpg (573843 個位元組) viv7.jpg (532099 個位元組)  viv9.jpg (542227 個位元組)

 viv11.jpg (508623 個位元組) viv12.jpg (523476 個位元組)


viv8.jpg (630857 個位元組)The speaker connections are Star(Germany)

viv10.jpg (624054 個位元組) TKD conductive plastic potentiometer volume control

h211.jpg (1187332 個位元組) Hasimoto special grade CUT CORE orient high B Output Transformer for 211 SET.





Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.3% (1.2% at 20Hz , 0.5% at 20KHz)
25W per channel , 1kHz total harmonic distortion typically 5%  (rated output)

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 ~ 60kHz  (20Hz -0.25dB, 20kHz -0.1dB, 60KHz -3dB)
Test at 25W  20Hz ~ 60kHz  (20Hz -2.2dB, 20kHz -0.1dB, 60KHz -3dB)

Input Sensitivity :  high gain 0.5V / 25W (rated output) , low gain 1.4V / 25W (rated output )

Output impedance : 4 ohm, 8ohm , 16ohm

Noise: Less than 1mV
Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 5687WA x2 ,6189A x2, 211 x 2, 5AR4(GZ34) x 4.

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

Total Weight: 29.5kg

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


Actual Price: HK$39800.




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