Wisdom in mind,   enthusiasm at heart.

HE-1 MK2
Regenerative power supplyy work as private electric generator
Real Balanced ACSS Pure Class A Preamp

Price: USD2280  (With metal remote, exclude shipping cost)
Please send your address, name  to audio-gd@vip.163.com get the quote.

What's new in the HE-1 MK2:
         The first generation HE-1 released in 2015 years.
         Since 2016 years , some lot customers asked me , do you have plan to upgrade HE-1?
         The analog circuits design is slower develop compare to the digital design. Especial the excellent design.
         In our product upgrade policy, we don't want declare the upgrade edition but just change the chassis or re-arrange the inside , no real upgrade on the design and sound quality.
         Since the first generation HE-1 released, we have not change its design , we always like to upgrade the design but we can't .
         After 5 years, in the 2021 years we spent the long term test and audition, now we are release the new version, it apply the perfect layout technology,   sound quality improve obviously, better detail and dynamic but more analog sound, no harsh anymore, and the functions also upgrade:
         1, It has two gain modes for user select to match with the different gain power amps.
         2, It has double volume control can match well with the different output level sources.
         3, The new design apply the same board of Left and Right channels that make the design exact same,that we can measure and match the boards for assemble in the one unit to ensure the consistency .

HE-1 MK2 summarize :
Unique fully analog regenerative power technology just like built in a private electric generator that offer the most clean power supply , boost the sound quality more transparency but analog , much better than the external digital technology power processor , not to say the passive LC power filter outlet .
Fully balanced class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
Non- feedback ACSS analog output stage.
Uses three R-core transformers (In total 260W ) and more than 60,000uf audio grade NOVER capacitors are used to ensure ample and smooth power delivery.
Separate class A PSUs power supply for regenerative drivers and audio signal amps .
Four-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality.
Four-channel 9 steps digital controller relay-based pre-volume control can control the source input level from 0DB (Bypass) to -8DB.
Two gain modes, high gain has 16DB and low gain has 6DB, which is more flexibility for the different gain power amp .
5 analog inputs:  RCA X2, XLR X2, ACSS X1 ( Even with RCA or XLR inputs, the output still had ACSS aviable)
3 outputs:   XLR / RCA / ACSS (ACSS and XLR/RCA have the separate output circuit design so they can connect 3 units power amp  simultaneously)
　

Detail of the Current Conveyor Technology

Unique fully analog regenerative power technology:
             While audio is life , the Power supply is water , Pure water create the wonderful life ,clean power supply reproduce the beautiful sound .
             The regenerative power supply like a proprietary electric generator built in the unit.
             It can block most disturb from the power line , supply the ultra clean power supply for the audio amps , reproduce the most neutral and analog sound like audio signal for the system and the users.
             In the regenerative power supply design, the AC power through the regenerative input transformer , conversion to DC power ,through the class A PSUs power supply for the regenerative wave generator and driver stages .
             A balance regenerative regular wave generator produce the ultra low distortion 50Hz wave ,through the balance  gain amps and the strong  output stages , drive the regenerative transformers produce the clean AC power supply feed to the separate class A PSUs power supply for the L and R channel preamps .
            The class A parallel connection PSU has very high input impedance to avoid disturb through the PSU from affecting the signal parts and low output impedance with very fast speed and high linear,  it is a very clean power supply.
             Audio-gd on the regenerative power supply design points  :
             1, Through analyzed the AP SYS-2722 , full analog design of the  regular wave generator have much lower distortion than the digital generator.
             2, Digital drive stages  have higher efficiency , but full analog drive stages  have much better analog sound like .
             3, 400Hz regenerative wave have higher efficiency , 50Hz regenerative wave had much far away the human ears sensitivity area than the 400Hz, boost the sound have much better analog sound like.

 

Unique real non-feedback ACSS technology:
             HE-1 MK2 is a true balanced design applying the newest ACSS design which can improve the XLR connection to sound as good as the ACSS connection. The HE-1 MK2 seem complex , but in fact they are the most simple design the world has ever had , their a lot components to process the power supply. The simplest and shortest signal journey brings out the most neutral and least colored sound.
            HE-1 MK2 applies ultra-low distortion single stage ACSS amplifier , an OPA already had built in two stages amplifier. they are soldered directly on the motherboard.
            The ACSS is a non-feedback technology made with discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and non-feedback can't do well in test measurements but can offer better sound for the human's ears. Here is a conflict of the classic circuits.
             But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.
             All signal gain is in current area, all transistors work in class A mode and applies class A power supplies.
             HE-1 MK2 has all components of four channels exactly matched before installation.

Unique I/V conversion volume control technology:
           The volume control is also different from conventional technology. Conventional volume control technology is the volume control implement in the analog amp input stage through a volume pot to reduce the signal  . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion  . Even the high performance volume pot ,in the attenuation then gain the signal mode ,still cause the detail lose and cause the S/N worst .
           In the HE-1 MK2, we applied the I/V conversion volume control , the volume control just  a variable passive I/V conversion place at the ACSS amp output , where the output is the current signal, not the voltage signal. The volume control is I/V conversion, and the volume depends on the current (I) conversion to the voltage (V). (Like R-2R D/A chips output passive I/V conversion)  It can keep the signal frequency band flat and not lost any detail. It can't degrade on sound quality in every volume level . After the volume , there are four groups  FET non-feedback buffer output stages offer the very low output impedance  .
            The volume control quality is much important in the real balance gear . It must guarantee the four channels signal control exact to achieve the performance of the real balance gear .  If the cool and hot of the balance signal can't guarantee exact, the balance output will has large distortion cause the sound quality and performance even much worst than a single end gear , waste the  balance gear  design and the cost.
            In HE-1 MK2 is applied a four channels digital control relays based volume control, through changing the tolerance 0.05% resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
            HE-1 MK2 have 100 steps volume control, applied Supper Exponential Volume Characteristic, easy match the volume with different power amp and speaker .While change the volume, the different relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.

           Supper Exponential volume characteristic    The Volume steps comparison to normal volume knob       
                                                              

Shield: 
         HE-1 MK2 has complete separation of left, right amplifier channels, regenerative drivers and transformer, even the 230V / 120V power input lines had shield in the two thick aluminum boards .
         HE-1 MK2 uses heavyweight all-aluminum  chassis to prevent the eddy current of transformers from interfering on circuit board.