CAX SS Portable Amplifier; ABnormal Sound Rhesus & Zenith...+

Discussion in 'Portable Headphone Amps' started by RuFrost, Nov 14, 2017.
  1. RuFrost
    Have anybody experienced any of three mentioned?
    1) From Cypherus Audio. Info from official site:
    CAX SS Portable Amplifier (the cost is between 120 and 200$, if I'm not mistaken - just do not remember exact number)
    A True Organic Linear Dual Mono Discrete Solid State
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    Description:
    CAX - Portable SS Amplifier

    Cypherus Audio amp is a fruit of my long research of portable headphone amplifier. It adopts an "old school" design with Discrete components configuration. It uses double-layered PCB with silver-coated soldering pads. It is designed using "Hand-Picked" matched sets of Triodes in Class A bias. No Op amps are used. Old School means Analog and Musical sounding.

    Background is silently black which makes it suitable for sensitive IEMs. As it uses a direct amplification design, it also powerful enough to drive large and hard-to-drive Headphones.


    It has single-ended input and output. It uses Lithium-Ion 3.7V battery. Charging is by 5v micro USB, very convenient. Charging is through a built-in separate PCB circuit to ensure no interference to the amp section.

    Proper discrete components selection are a long and tedious manual process. Most components are precisely matched to get good sounding. It is hand-picked and required a lot of time for the testing and matching. Better quality components are also a must. Design is harder in portable circuit as it requires more space than Op amp-based designs. Each amp is hand- and ear-tuned.

    The end products, however, are well-worth the effort. They have high resolution sound quality, clean but powerful sound with minimal interference.


    Specs:
    Size: 110mm x 64mm x 23mm
    Weight: 143 grams
    Output: 32 to 600 ohms
    Less than 3 ohms output impedance
    Built in rechargeable Lithium Ion battery
    Playing time > 8 hours
    Charging time 2 hours (using 1A Charger)
    Made in Indonesia 100%

    2) The twin brothers from ABnormal Sound: Rhesus (189$) & Zenith (169$)
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    Material specifications :
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    * Rhesus - Full Discrete Amp

    - Dual layer FR4-TG140 / 1.6mm / 1 oz Cu / Through hole PCB board
    - Vishay 0204 Resistor
    - Siemens Tantalum SMD capacitors
    - Nichicon Muse BP & Fine gold coupling capacitor
    - Toshiba transistors
    - Alps potensio
    - Foxconn 3.5mm connector
    - Selectable Gain switch - 3 mode
    - Micro USB charging port
    - 900mAh Li-ion battery (6 Hours Non-Stop play time)
    - Aluminium box

    * Zenith - Hybrid amp

    - Dual layer FR4-TG140 / 1.6mm / 1 oz Cu / Through hole PCB board
    - Vishay 0204 Resistor
    - Siemens Tantalum SMD capacitors
    - Nichicon Muse BP & Fine gold coupling capacitor
    - Toshiba transistors
    - Alps potensio
    - Foxconn 3.5mm connector
    - lm412ACN (Default Opamp, rollable)
    - Selectable Gain switch - 3 mode
    - Micro USB charging port
    - 900mAh Li-ion battery (6 Hours Non-Stop play time)
    - Aluminium box

    Dimensions :
    8 x 5 cm without potensio knob
    or
    10 x 5 cm with knob

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    Technical specifications :
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    Ouput power :
    @600 ohm = 29mW
    @300 ohm = 56mW
    @150 ohm = 104mW
    @64 ohm = 211mW
    @32 ohm = 346mW
    @16 ohm = 500mW

    - Max Output level = 5.3Vrms (for best performance)
    - full power bandwidth limit @ Vout - 7vpp and Rload - 500ohm = 12.2 MHz (rhesus) or depends on opamp installed (zenith)
    - power consumption : +-150mA

    3 gain selectable :

    1st gain for input level more than 2vrms (max 2.5Vrms)
    2nd gain for input level 1.5vrms
    3rd gain for input level less than 1vrms
     
    Last edited: Nov 14, 2017
  2. RuFrost
    Anybody?
     

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