The Real  300B-MB Power Amplifier  



Audio Experience THE REAL 300B-MB Mono Block Power Amplifier is a Class A SET Single Ended no negative feedback design power amplifier. It provides sound deep and wide stage, accompanies with reality sound image and a emotions sound presentation.
 
It uses one 300B triode power tubes working at Class A Single Ended Triode no negative feedback configuration status to provide 9W adequate output for most of the Hi-End Speakers to ideal performance. Moreover, the high quality output transformer combines with high performance Class A SE circuit design lead to an extremely low loss, wide sequence sound effect and excellent phases output. 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. 

The input/driver stage is new design for 300B power tube, The input stage 6SN7 tube use M-CAP® Supreme Silver / Gold & Oil coupling cap to driver stage 6SN7 tube, The first driver stage use V-Cap CuTF coupling cap to second driver stage 71A triode power tube to driver Hasimoto A-105 Interstage transformer, This new design driver stage got the wide frequency range and very good sound. The interstage transformer direct coupling to 300B power tube , The 300B power tube working at Class A SET Single Ended Triode mode to driver Hasimoto H-30-3.5S output transformer , The Hasimoto Hasimoto H-30-3.5S CUT CORE orient high B output transformer has very low Insertion Loss 0.3dB 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.

    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. 

 


thereal300bmb2.jpg (499494 個位元組) thereal300bmb3.jpg (604370 個位元組) thereal300bmb4.jpg (627843 個位元組) 

thereal300bmb5.jpg (557067 個位元組) thereal300bmb6.jpg (522149 個位元組) thereal300bmb7.jpg (552421 個位元組)

thereal300bmb8.jpg (530989 個位元組) thereal300bmb9.jpg (576750 個位元組) thereal300bmb10.jpg (520895 個位元組) 

thereal300bmbin.jpg (525374 個位元組)


Features


c10.jpg (332843 個位元組) Hasimoto C-10-130W  CUT CORE orient high B Choke.

a-105.jpg (466866 個位元組) Hasimoto A-105 CUT CORE orient high B Interstage Transformer

h30.jpg (300557 個位元組) Hasimoto H-30-3.5S CUT CORE orient high B Output Transformer

 


 Specifications

Output and T.H.D :  

1W per channel , 1kHz total harmonic distortion typically 0.5% (30Hz is 1.5% , 20KHz is 0.8%)
9W per channel , 1kHz total harmonic distortion typically 5%  (rated output)

Input :  RCA 

Input Impedance : 100K ohm 

Frequency Response:

Test at 1W  20Hz ~ 56kHz  (20Hz  -1dB, 56KHz  -3dB)
Test at 9W  20Hz ~ 56kHz  (20Hz  -2dB, 56KHz  -3dB)

Input Sensitivity :  0.36V / 9W      28dB  gain (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: 6SN7 x2 , 71A x2 , 300B x 2, 5U4G or 274B  x 2 

Dimension: 400mm x 300mm x 235mm (W x D x H)

Total Weight: 30kg ( total two block )

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

Actual Price: 
without 300B tube HK$47,880 one pair.
with Electro-Harmonix 300B tube HK$49,380 one pair.
with EML 300B-Mesh tube HK$54,280 one pair.


 

 

YS-Audio
Room1308, 13/F,BLK C,.  
Kai Tak FTY BLDG.   
99-101 King Fuk ST,.   
San Po Kong,   KLN,.
Hong Kong
Tel:(852)93440168    
E-mail : info@ys-audio.com 
WhatsApp: 93440168   
facebook :
https://www.facebook.com/AudioExperienceYSaudio/