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    HD88

    New Concept Tube Power Amplifier

  • Introduction to the Characteristics of Products

    Innovative Circuit

    1. The boot process is impact-free, gradually loading power over time.

    2. Power tube automatic bias servo tracking control eliminates the need for user adjustmentthroughout the entire lifespan.

    3. The new circuit design features an innovative quasi-symmetric configuration.

    4. Minimal negative feedback is utilized in a short loop.

    5. Low internal resistance drive between amplification stages ensures excellent high transientcharacteristics.

    6. Complete isolation of high and low pressure, along with a highly efficient and fully regulatedpower supply, is implemented for high voltage applications.

    7. A large dynamic gain-power matching design is employed.

    Innovative technology

    1. The innovative power tube's mellow audio processing technology improves the lifespan ofelectronics and enhances heat dissipation capacity.

    2. The separator cover is coated with nano-graphene ceramic material, effectively converting heatinto far-infrared radiation to enhance heat dissipation.

    3. Hybrid shed technology is a unique crafting technique.

    4. Custom machine inner wires are used for their high temperature resistance, high pressureresistance, shielding capabilities, and super soft multi-strand silver-plated pure copper wire
    composition.

    5. The special double-layer chassis structure features aerospace aluminum alloy panels withmultidimensional machining for the purposes of anti-vibration and anti-electromagnetic
    interference.

    6. The power socket provides a safety guarantee to overcome EMI interference.

    7. An advanced audio transformer with an independent double negative feedback structure isutilized.

    8. Highly reliable electronic components are screened, including electrolytic capacitors that havehigh temperature resistance, long life, and low internal resistance.

    9. Audio input/output interfaces are plated with non-magnetic rhodium to minimize signal pollution.

    10. The front tube shield damper heat sink helps improve the signal-to-noise ratio and reducemicrophone effect.
    Innovation function

    1. Vacuum tube amplifiers have multiple modes: integrated amplifier mode, mono-biamp mode, mono-wire mode, and mono-bridge mode.

    2. Always ready and on standby, the power tubes in this amplifier feature a small currentpreheating mode, allowing you to enjoy the best audio at any time.

    3. This amplifier has superb overload resistance and can handle a minimum 2-ohm load whenbridged.

  • Amplifier technical specification

    Rated stereo output power:

    60W per channel at 8 Ω, 20Hz to 70KHz, -3dB

    Maximum undistorted stereo output power:

    66W per channel at 8Ω,80W per channel at 4Ω, 1kHz

    Bridge mono output power:180Wat 8Ω, 1KHz

    Frequency range:

    6Hz to 80KHz±1dB(at 1 watt into 8Ω) 0dB at 1KHz

    Stereo power bandwidth:

    20Hz to 65KHz -3db; 0dB=60W 1KHz, 8Ω

    20Hz to 70KHz -3db; 0dB=50W 1KHz, 8Ω

    7Hz to 73KHz -3db; 0dB=25W 1KHz, 8Ω

    Total harmonic distortion:

    Less than 0.3% at 1W output,20Hz to 20KHz,8Ω,typically 0.05% @1kHZ.

    Less than 1% at 60W output,40Hz to 15KHz,8Ω,typically ≤0.8% @1kHz

    Circuit model: Modified UL, Class AB1

    Bias adjustment: Auto Biased

    The amount of negative feedback: Less than 6dB

    The Input Impedance: 25KΩ

    Input Sensitivity: Max. 690mVrms at 1KHz for 60 watt output

    Rated Output Impedance:

    Signal to noise ratio: 98dB (A weighted)

    Tube service: 4 x KT88;4 x 6SN7; 2 x 6922

    Machine size: 17(W) x 15(D) x 10 (H) inches

    44 (W) x 37 (D) x 27(H) cm

    Machine Weight: 79 lbs (36kg) N.W. 93 lbs (42 kg ) G.W.

    Fuse: 220VAC,T3.15A,115 VAC,T6.3A

  • FRE-1W

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    FRE-25W

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    FRE-50W

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    FRE-60W

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    THD-1W

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    THD-25W

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    THD-50W

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    THD-60W

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  • List of Tubes Used

    This machine uses two 6922 vacuum tubes and four 6SN7 vacuum tubes for the front stage of amplification. The rear stage uses four Russian KT88 vacuum tubes for push-pull amplification.

    TF* is Tube Fidelity Company's special pure thickness sound processing Tube, which has the effect of pure thickness and pure sound, eliminating noise, and improving sound quality.

    Vacuum tube model for this machine

    6922EH

    6SN7EH

    SVKT88 TF*

    Alternative vacuum tube options

    E88CC

    6N8P,CV181

    6550