JD20

Pure · Balanced · Powerful Drive Capability
The JOLIDA JD20 Fully Balanced Tube Preamplifier is a flagship preamplifier distinguished by transparency, speed, detail density, and driving capability.

The appearance features a CNC-machined solid aluminum alloy front panel, presenting a minimalist, stable, and premium visual style. Combined with dual circular touch-screen display interfaces, it embodies a pure and modern Hi-End design language.

Its sonic performance is exceptionally transparent and pure, with clear imaging and natural dynamics. It not only retains the musical warmth characteristic of vacuum tube equipment, but also delivers the speed, resolution, and low-distortion advantages typically associated with solid-state amplifiers.

At the core of the JD20 are four 6922EH dual-triode vacuum tubes operating in a fully analog and fully symmetrical amplification architecture, together with an ultra-low-noise electronically regulated power supply, ensuring signal transmission under an extremely low-noise background.

The unique precision fully symmetrical R2R resistive volume controller enables the JD20 to achieve extremely low sonic coloration while supporting ±10 levels of fine adjustment, allowing the preamplifier to reach professional monitoring standards in both precise level control and soundstage positioning.

The JD20 provides as many as eight inputs and six outputs, supporting bypass mode and balanced high-frequency rebalancing technology. It is also equipped with 12V trigger interfaces for synchronized power-on operation. It is suitable for multi-source systems, active crossover architectures, multi-power-amplifier systems, and other high-end audio configurations.

The JD20 is not only a high-performance preamplifier but also the control center of an entire audio system, providing high-standard signal management and outstanding sonic performance for audiophiles, studio monitoring applications, and large-scale multi-channel audio systems.

1.Rich input and output interfaces to accommodate multi-source input switching and multi-channel crossover output applications.

2.Electronically regulated high-voltage and low-voltage power supplies with a 45-second automatic warm-up mute function.

3.Ultra-low-noise power supply with ripple lower than 100 dBc.

4.Special balanced-input and balanced-output high-frequency rebalancing capability ensures full-frequency symmetry of both signal paths in balanced operation.

5.Special low-distortion and low-noise RCA output design minimizes THD+N degradation during single-ended output operation.

6.Ultra-low THD+N fully balanced amplification design:
• XLR Output: ≤0.004% @ 1 kHz
• RCA Output: ≤0.006% @ 1 kHz

7.Fully analog and fully symmetrical R2R volume controller with extremely low sonic coloration.

In addition to 128-step adjustment, each attenuation step between levels 10 and 117 allows ±10-step fine adjustment.

8.Dedicated phase inversion control compatible with different XLR wiring standards used in Europe, America, and Japan, eliminating the need for cable modifications while supporting phase correction of early recordings.

9.Powerful output capability capable of driving 20-meter audio cables without performance degradation.

10.User-friendly interface featuring dual 2.1-inch touch-and-press LCD displays providing:
• Master volume control
• Mute control
• Standby control
• Input selection
• Phase inversion control

11.Two +12V trigger outputs for synchronized turn-on control of power amplifiers.

12.Control Functions
• 2.1-inch interactive touch screen
• Infrared remote control
• 128-step volume control
• ±10-step volume fine adjustment
• Push-button control for standby and mute functions
• Dual +12V trigger outputs on the rear panel

• Fully Balanced Analog Architecture
Employs a fully balanced analog signal path to achieve excellent channel symmetry, low distortion, and superior noise rejection.

• High-Frequency Rebalancing Technology

Special high-frequency rebalancing technology maintains signal symmetry throughout the full frequency range for balanced input and output operation.

• Ultra-Low-Noise Electronically Regulated Power Supply

Power supply ripple is lower than -100 dBc, providing an exceptionally quiet operating environment for audio signals.

• Powerful Drive Capability

Capable of driving signal cables up to 5 meters without degradation in sound quality.

• Fully Symmetrical Precision R2R Volume Controller

Precision resistor-ladder volume control design ensures minimal sonic coloration and excellent channel matching.

• ±10 Fine Adjustment Function

Provides precise soundstage and level adjustment for optimized system setup.

• 8 Inputs and 6 Outputs

Supports complex high-end audio system configurations and multiple source components.

• Bypass Mode

Suitable for external volume controllers, processors, or home theater integration.

• Touch-Screen User Interface and Minimalist Design Language

Combines modern aesthetics with intuitive operation.