HD88

      HD88 

New Concept Tube Power Amplifier

Introduction to the Characteristics of Products

Innovative Circuit

1. Boot without impact, slowly load power over time.

2. Power tube automatic bias servo tracking control with no user adjustment required throughout the entire lifespan.

3. New circuit design featuring innovative quasi-symmetric configuration.

4. Short loop with minimal negative feedback utilized.

5. Low internal resistance drive between amplification stages to ensure excellent high transient characteristics.

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

7. Large dynamic gain-power matching design.

Innovative technology

1. Innovative power tube mellow audio processing technology improves electronic life and enhances heat dissipation capacity.

2. The separator cover is coated with nano-graphene ceramic material, effectively converting heat into far-infrared radiation and increasing heat dissipation.

3. hybrid shed technology is a unique craft technology.

4. Custom machine inner wire is used, which has high temperature resistance, high pressure resistance, shielding, and super soft multi-strand silver-plated pure copper wire.

5. The special double-layer chassis structure features aerospace aluminum alloy panels with multi-dimensional machining for anti-vibration and anti-electromagnetic interference purposes.

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

7. Advanced audio transformer with an independent double negative feedback structure is utilized.

8. Highly reliable electronic components are screened, including electrolytic capacitors that have high 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 reduce microphone effect.

Innovation function

1. Vacuum tube amplifiers have multiple modes: integrated amplifier mode, mono-bi amp mode, mono-bi wire mode, and mono-bridging mode.

2. Always ready and on standby, the power tubes in this amplifier feature a small current preheating 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 when bridged.

Technical Specification

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

Maximum Power Output:66W per channel at 8Ω，80W per channel at 4Ω, 1kHz

Bridged mono Output Power：180W(8Ω, 1KHz)

Frequency Repsonse: 6Hz to 80KHz±1dB(1W, 8Ω) 0dB at 1KHz

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

THD+N: ≦0.3% (1W ,20Hz-20KHz, 8Ω). ≦0.05% at 1kHZ

             ≦1%  (60W , 40Hz-15KHz, 8Ω). ≦0.8% at 1kHz

Circuit Type:  Modified  UL, Class AB1

Bias Adjustment: Auto Biased

Negative Feedback:Less than 6dB

Input Impedance: Less than 25K ohms

Input Sensitivity:  Max. 690mVrms(1KHz,60 W)

Rated Output Impedance:  6 Ω

SNR: 98dB (A weighted)

Tubes Used: 2 x KT88,4 x 6SN7,2 x 6922 

Dimensions: 17.32 (W) x 14.57 (D) x 8.7 (H) inches ( 44 x 37 x 27 cm)

Weight:79 pounds(36 kg) net,approximately 108 pounds( 49 kg) Packaged

Fuse: 100-110 VAC, T6.3A, 200-240VAC  T3.15A. 5mm X 20mm

Warranty: One years limited parts and labor. Six months or 500 hours whichever comes first on Jolida Tubes.