The Real Power-MB Mono Block Power Amplifier Version 2 (June 2022)
The input/driver stage is new design for Class A Parallel Single Ended , The 6J5 input tube use M-CAP® Supreme Silver / Gold & Oil coupling cap to EML 30 triode driver tube . The EML 30 driver tube use V-Cap CuTF coupling cap to 6BX7GT cathode follow driver stage, The cathode follow stage is direct coupling to Two EML 300B-XLS power tube , The Two EML 300B-XLS power tube working at Class A Parallel Single Ended Triode mode to driver Hashimoto special grade CUT CORE orient high B 60W Single Ended output transformer, This Hashimoto special grade CUT CORE orient high B output transformer has very low Insertion Loss 0.25dB 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 power supply with two separately HVB+
power supply for power output stage and input driver stage:
One Hashimoto power transformer with Hashimoto C-core choke and GZ34 (5AR4) rectifier tubes x 4 for power output stage..
One Hashimoto power transformer with Hashimoto C-core choke and EZ81 rectifier tubes for 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.
Version 2 improved the driver stage, the sound have full upgrade about 30%.
The T.H.D of Version 2 is 0.28% 1kHz at 1W , The before Version is 0.5% 1kHz at 1W.
Hasimoto special grade CUT CORE orient high B 60W Single Ended output transformer
Output and T.H.D :
Input : RCA , XLR
Input Impedance : RCA is 100K ohm, XLR is 50K ohm
Test at 1W 20Hz ~ 60kHz
(20Hz -1dB, 60KHz -3dB)
Input Sensitivity : 0.65V / 40W 30.5dB gain (Test at 8 ohm )
Output impedance : 4 ohm , 8ohm , 16ohm.
|Noise: Less than 1.3mV|
|Phase Mode : Normal|
Construction: Copper and High quality aluminum
|Tubes Required for one block : 6J5 x1 , EML30 x1 , 6BX7GT x1, EML300B-XLS x2 , GZ34 x4 , EZ81 x1|
Dimension: 455mm x 438mm x 300mm (W x D x H)
|Weight: 33.8kg ( one block )|
Power Source: 220-240V,50/60Hz
Standard Version HK$92,000 with EML 300B-XLS 40W Class A output.
HK$90,000 with EML 300B 20W Class A output.
HK$99,000 with EML
1605 50W Class A output.
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
99-101 King Fuk ST,.
San Po Kong, KLN,.
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