The Real 300B-MB mono block power amplifier

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.

Features

Class A Single Ended Triode no negative feedback
New design 6SN7 and 71A triode tubes with driver interstage
M-CAP® Supreme Silver / Gold & Oil coupling cap
V-Cap CuTF coupling cap
Hasimoto A-105 Interstage Transformer to driver 300B power tube.
Hasimoto H-30-3.5S CUT CORE orient high B Output Transformer
Hasimoto C-10-130W Choke
Hasimoto special grade Power Transformer
The speaker connections is Star(Germany)

Hasimoto C-10-130W CUT CORE orient high B Choke.

Hasimoto A-105 CUT CORE orient high B Interstage Transformer

Hasimoto H-30-3.5S CUT CORE orient high B Output Transformer

The Real 300B-DM . Dual mono in one block version

Review from Hiendy Hi Fi forum.

真的漢子真的系列-The Real 300B-MB 全港首個用家初評評

https://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=124369

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$49,680 one pair.
with Electro-Harmonix 300B tube HK$5,1180 one pair.
with EML 300B-Mesh tube HK$57,000 one pair.

The rectifier tube from EH 5U4G upgrade to use EML 274B- Mesh add extra cost $5200.

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
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