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HE-1
Regenerative power supply
Real Balanced ACSS Pure Class A Preamp

           

        
 
Summarize Use Manual Specs Shipping Cost


Shipped since July 2019, the unit has upgraded the transformers , can power on long term.

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Auto dark the display:
         While the unit selected input 5 and the volume on 0 step, turn the volume knob lower 1 step, the left second display show "1" mean the auto dark active, the display will dark after you stop operate all buttons .
         If you want disable the function, While the unit selected input 5 and the volume on 0 step, turn the volume knob lower 1 step to let the left second display show 0 .

Display inform:
         Left first mean the input channel number .
         Left second mean the auto dark function.
         Another two display mean the volume level, number higher volume is higher .


The unit applied input short design :
         The unit  had design the analog idle input short circuit for avoid the disturb between different sources.
         This design also applied in a lot high end
brand devices.
         The working theory : 
Without the idle input short circuit ,if the input 5 and input 4 had connect two extra DACs,  while users select the either input 5 and input 4 , the another input signal will fire through the circuits and mix  into the using signal, even though this signal is  weak  but still can degrade on the sound quality.
          With the idle input short circuit function : if user select either the input 5 and input 4, the another input signal will short circuit then no any signal fire through circuits , can keep the sound quality had not degrade.

          In world there are more than 99% DACs and the sources had allow the outputs short ,
          Below case users don't want the idle input short circuit function, users can open the chassis, pull off the jumpers of the proper input channels, please note must pull off of left and right channels together :
        1, The same extra source not only connect the
unit analog input, but connect with other amps simultaneity.
        2, The same extra source connect to the
unit different inputs  at simultaneity.


Selector switch :

          Select the HE-1 inputs from IN 1 to IN 5.

Volume knob :
          Select the HE-1 volume control .

   
  


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