Reference-X 211SE Stereo Power Amplifier  


Audio Experience Reference-X  211SE is a SE 27W x 2 Stereo Valve Tube Power Amplifier.
   The power amplifier use one 211 power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 27W 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. 



real211v18b.jpg (485856 個位元組)  real211v18d.jpg (511659 個位元組)  real211v18c.jpg (590855 個位元組)  real211v18i.jpg (357331 個位元組)  


real211b1.jpg (595602 個位元組) The speaker connections are Star(Germany)


real211v18is.jpg (300150 個位元組) Coupling caps use Jupiter Copper foil (wax paper and Polypropylene film) and MultiCap RTX

h-40-10s.jpg (989480 個位元組) Hasimoto H-40-10S CUT CORE orient high B Output Transformer




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

Input :  RCA one pair

Input Impedance : 100K ohm.

Frequency Response:

Test at 1W  20Hz ~ 63kHz  (20Hz -1.5dB, 20kHz -0.1dB, 63KHz -3dB)
Test at 27W  20Hz ~ 60kHz  (20Hz -2.5dB, 20kHz -0.1dB, 60KHz -3dB)

Input Sensitivity :  0.95V / 27W (rated output)    24.5dB Gain (test at 8ohm.)

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: 33kg

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


Actual Price: HK$41300

h211.jpg (1187332 個位元組) The output transformer from Hashimoto H-40-10S upgrade to Hashimoto special grade  add extra cost HK$4500. 

Hashimoto special grade Output Transformer have better low frequency response than H-40-10S.
Test at 1W  20Hz ~ 63kHz  (20Hz -1dB, 20kHz -0.1dB, 63KHz -3dB)

Test at 27W  20Hz ~ 60kHz  (20Hz -1.5dB, 20kHz -0.1dB, 60KHz -3dB)



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