Gustard H20 Opamp Dual LM49720 Full Balanced Class A Headphone Amplifier Pre Amplifier

Gustard H20 Opamp Dual LM49720 Full Balanced Class A Headphone Amplifier Pre Amplifier

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Each channel uses two independent amplifying units to form a symmetrical output line, Single-ended and balanced output are at the same time ;

The front class consists of a single 4-way amplifier circuit, using two LM49720 dual op amp;
Have a separate pre-stage output, can be connected to active speakers or pure after the class;
The use of matrix relay volume, effective to ensure that 4-way volume unanimous;
Native full-balanced architecture, from input to volume control to before and after zoom, without any conversion, complete four-way architecture;


Technical Parameters: 
The power amplifier circuit uses separate Class A lines, each channel 2 pairs of power tube, a total of 8 pairs of power tube; 
The main filter uses Nikon nichicon audio capacitor KG gold tune 
Equipped with third gear gain (high,middle,low), Support amp and line (XLR) output at the same time; 
There are three inputs: RCA * 1, XLR * 2 
The left and right channels each adopt a custom 50W audio ring transformer, completely independent of each other without interference; 
All aluminum chassis, silver and black colors available;

Machine size: 330 * 260 * 65MM (without protruding parts); 
Packaging size: 420 *360*175MM;
Package weight: 6.0KG;


H20 Parameters:
Line input: 1*RCA, 2*XLR
Line output: XLR * 1 (Preamp output)
Amp output: 1*6.35mm single-ended high resistance,
                     1*6.35mm single-ended low resistance
                     2*Three-core balanced Output, 1*four-core balance output


Analog input:
RCA standard input group, input sensitivity typical value: 2Vrms; input impedance 47kΩ
XLR balanced input two groups, input sensitivity typical: 6Vrms; input impedance 2.4kΩ
Front analog output (XLR):
Output impedance 200Ω
Frequency response: 20-80kHz /-0.1dB
Signal to noise ratio:> 122dB
Channel crosstalk: -130dB @ 1kHz
THD + N: <0.0004%
IMD: <0.0004%

amp output:
Frequency response: 20-80kHz /-0.1dB
Signal to noise ratio:> 120dB
Channel crosstalk: -120dB @ 1kHz
THD + N: <0.0005% @ 6000mW into 32Ω LOAD
IMD: <0.0005% @ 6000mW into 32Ω LOAD
Maximum distortion output power 6000mW into 32Ω LOAD
Maximum output power 12000mW @ 32Ω (THD = 1%)
Load power:
64Ω 5360mW
150Ω 2680mW
300Ω 1340mW
600Ω 670mW 
Each channel uses two independent amplifying units to form a symmetrical output line, Single-ended and balanced output are at the same time ;

The front class consists of a single 4-way amplifier circuit, using two LM49720 dual op amp;
Have a separate pre-stage output, can be connected to active speakers or pure after the class;
The use of matrix relay volume, effective to ensure that 4-way volume unanimous;
Native full-balanced architecture, from input to volume control to before and after zoom, without any conversion, complete four-way architecture;


Technical Parameters: 
The power amplifier circuit uses separate Class A lines, each channel 2 pairs of power tube, a total of 8 pairs of power tube; 
The main filter uses Nikon nichicon audio capacitor KG gold tune 
Equipped with third gear gain (high,middle,low), Support amp and line (XLR) output at the same time; 
There are three inputs: RCA * 1, XLR * 2 
The left and right channels each adopt a custom 50W audio ring transformer, completely independent of each other without interference; 
All aluminum chassis, silver and black colors available;

Machine size: 330 * 260 * 65MM (without protruding parts); 
Packaging size: 420 *360*175MM;
Package weight: 6.0KG;


H20 Parameters:
Line input: 1*RCA, 2*XLR
Line output: XLR * 1 (Preamp output)
Amp output: 1*6.35mm single-ended high resistance,
                     1*6.35mm single-ended low resistance
                     2*Three-core balanced Output, 1*four-core balance output


Analog input:
RCA standard input group, input sensitivity typical value: 2Vrms; input impedance 47kΩ
XLR balanced input two groups, input sensitivity typical: 6Vrms; input impedance 2.4kΩ
Front analog output (XLR):
Output impedance 200Ω
Frequency response: 20-80kHz /-0.1dB
Signal to noise ratio:> 122dB
Channel crosstalk: -130dB @ 1kHz
THD + N: <0.0004%
IMD: <0.0004%

amp output:
Frequency response: 20-80kHz /-0.1dB
Signal to noise ratio:> 120dB
Channel crosstalk: -120dB @ 1kHz
THD + N: <0.0005% @ 6000mW into 32Ω LOAD
IMD: <0.0005% @ 6000mW into 32Ω LOAD
Maximum distortion output power 6000mW into 32Ω LOAD
Maximum output power 12000mW @ 32Ω (THD = 1%)
Load power:
64Ω 5360mW
150Ω 2680mW
300Ω 1340mW
600Ω 670mW 

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