The Real 300B-MB Power Amplifier
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.
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
Output and T.H.D :
Input : RCA
Input Impedance : 100K ohm
Test at 1W 20Hz ~ 56kHz
(20Hz -1dB, 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
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.
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
99-101 King Fuk ST,.
San Po Kong, KLN,.
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