HD88 - jolida.com

HD88
New Concept Tube Power Amplifier

Introduction to Product Characteristics

Diverse functions. Three modes for one machine (Integrated stereo amplifier, Two single-channel power amplifiers, Bridged single-channel amplifier).
Soft power-on.
High energy standby. Power tube small current burn in.
Automatic deflection servo tracking of power tube. The full life cycle is free of user adjustment.
First invention of power tube "thick sound" processing technology. Improves tube life.
The pre-amplifier tube uses a shielded damping radiator cover. Improve signal-to-noise ratio. Reduce microphone effect.
Extremely strong overload resistance. The bridged amplifier can connect to a minimum 2 ohm load.
The socket is a medical grade safety assurance power filter. Suppresses EMI Interference.
The hood is detachable, and its surface is nano-graphene ceramic coated. The machine’s heat is effectively converted into far-infrared radiation.
Original and novel circuit design. Innovation of quasi - symmetric topology.
High and low voltage isolation, high efficiency, regulated high voltage power supply.
High-end audio transformer with independent dual feedback.
Short loop low negative feedback application.
Low inner resistance drives between amplification chains. Ensures good large signal transient characteristics.
Selectively chosen highly reliable electronic components. Electrolytic capacitors are high temperature resistant, long life, and low internal resistance.
Input and output interface is rhodium – plated, without magnetic effects. Minimum signal contamination.
PCB hybrid cabling technology. Unique craft design.
The inner wire is customized, high temperature and high pressure resistant, shielded, super soft, multi-strand wire, silver plated, pure copper wire.
Chassis structure is unique double layer. Curved aircraft aluminum alloy panel. Anti-vibration, anti-electromagnetic interference.

Amplifier technical specification

Rated stereo output power:     
60W per channel at 8 Ω, 15Hz to 45KHz, -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 65KHz-3dB(at 1 watt into 8Ω) 0dB at 1KHz
Stereo power bandwidth:
15Hz to 45KHz -3db; 0dB=60W 1KHz, 8Ω
12Hz to 50KHz -3db; 0dB=50W 1KHz, 8Ω
8Hz to 60KHz -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. 550mVrms at 1KHz for 60 watt output
Rated Output Impedance: 6Ω
Signal to noise ratio: 98dB at rated output，No Weighted
Tube service: 4pcs KT88；4pcs 6SN7; 2pcs 6922
Machine size: 44 cm(W)37 cm(D)27 cm(H)
Machine Weight: 36Kg net, 42 Kg Packaged
Fuse: 220VAC,3.15A/115 VAC,T6.3A
 

FRE-1W

FRE-25W

FRE-50W

FRE-60W

THD-1W

THD-25W

THD-50W

THD-60W

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.