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

SKU: Gustard-H20
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Price: US$929.99
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  • Each channel uses two independent amplifying units to form a symmetrical output line.
  • 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;

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Details

Description

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

There is Pre-amp output,Gustard H20 could be used as Power amplifier and Pre Amp connecting Active Monitor.

 

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;

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;

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;

 

Specification

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

Customer Questions & Answers

Vladimir
Vladimir

Damping factor???

11/4/17 7:25 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Hi,More than 1000.Thank you.

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Vladimir
Vladimir

Can I use the amplifier in my record studio for listening to the HD reference record?

11/7/17 9:41 AM Asked.
shenzhenaudio.com
shenzhenaudio.com

Hi Vladimir,yes,it can.Thank you.

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Alexey

Can you please specify the output impedance for each of the outputs:  6.35mm single-ended high resistance,  6.35mm single-ended low resistance,  2*Three-core balanced,  1*four-core balanced.    Is the output impedance for the balanced output(s) really 200 ohm? This number is unusually high, I think it is typically under 1 ohm. If I understand it correctly, the damping factor is calculated as (headphones impedance/ amplifier output impedance), so for headphones with 100 ohm impedance the damping factor would be 0.5, not 1000?    Sorry if my calcualations are incorrect, I don't have a proper background, just trying to understand why this particular characteristic, the output impedance, is so different from other hi-end amplifiers.

1/19/18 4:21 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear,    The back preamp out impedance is 200Ω  6.35mm single-ended low resistance impedance is 50Ω.

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Alexey

What is the output impedance of these headphone outputs:  single-ended high resistance, four-core balanced output?

1/20/18 4:17 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear Alexey,it less than 0.1Ω.Thank you.

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Anthony
Anthony

Hello,    What is the gain level for the different gain settings? Thank you.

2/19/18 6:45 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear Anthony,it's 1dB.Thank you.

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David
David

Hi!    Is it really 200ohm. Like it says on product detalis?    Front analog output (XLR):    Output impedance 200Ω

2/26/18 3:32 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear David,Front analog output (XLR):Output impedance<0.1Ω.  200Ω is rear xlr output impedance.

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Anthony
Anthony

Hello,  Is the output of 12000mw at 32 ohms total or 12000mw per channel? Thank you.

3/5/18 10:56 AM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear Anthony,12000mw per channel.Thank you.

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Alexandr

Can you say supply voltage for op amp (six photo), this is lm49720?

3/10/18 11:29 AM Asked.
shenzhenaudio.com
shenzhenaudio.com

Dear Alexandr,+-15voltage.yes, this is lm49720.

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Alexandr
Alexandr

Hello, how much linger this devise be in stock? I can buy only next year.

3/16/18 8:46 PM Asked.
shenzhenaudio.com
shenzhenaudio.com

Hi, thank you for your message.  We are not sure right now.  Could you tell me the exact time you are planning to buy this product?  Thanks and best regards.  Shenzhenaudio

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Alexandr
Alexandr

Hello, can you say fuse ampere?  Thx.

3/19/18 9:38 AM Asked.
shenzhenaudio.com
shenzhenaudio.com

Hi, the fuse for Gustard is 2-2.5A.  Thanks and best regards.  Shenzhenaudio

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