Reference One MK2  Mono Block Power Amplifier



Audio Experience Reference one Mk2 Mono Block Power Amplifier is a True Full balanced design power amplifier. It provides sound deep and wide stage, accompanies with reality sound image and a emotions sound presentation.



They have two power amplifier unit for positive pole and negative pole at each block. Two block total four power amplifier unit. 

The structure of each power amplifier unit:
The input stage is 12AT7 SRPP direct coupling to 12AU7 driver stage , The driver stage use high quality capacitors to Gold Lion KT77 power tube , The Gold Lion KT77 work at P-P UL mode to driver Hasimoto HW-60-5 CORE orient high B high quality output transformer , The HW-60-5 output transformer has very low Insertion Loss 0.2dB only. ( Many tube power amplifier in Hi-End audio market , Their have the output transformers is over 1dB 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 bias adjust of power tube is very easy , all bias test point and bias adjust at top of amplifier.

 The components ,  NFB value , tube type , circuit all select by listen test.

The  use high quality transformers .

hw60.jpg (283797 個位元組) Hasimoto HW-60-5


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Output and T.H.D :  
1W at 8 ohm load , 1kHz total harmonic distortion typically 0.03% (20Hz 0.06%, 20KHz 0.05%)
112.5W at 8 ohm load , 1kHz total harmonic distortion typically 1.5%  (rated output)
190W at 8 ohm load , Max output.

Input :  Balanced ( XLR ) x 1

Input Impedance :  200K ohm

Frequency Response:  
Test at 112.5W  20Hz ~ 80kHz  (20Hz -0.3dB, 20kHz -0.1dB, 80KHz -2.6dB)

S/N: >100dB

Input Sensitivity: 2V RMS rated output.
Damping factor : approximately 29
Tubes Required for each black: 2 match pair KT77 Power Output , 1pcs 12AU7 Driver , 1pcs 12AT7 Input .

Phase Mode : Normal

Dimension: 300mm x 438mm x 233mm (W x D x H) each

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

Actual Price: 36900 one pair.



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