[🎶SG] Gustard H26 Fully Balanced Discrete Class A Headphone Amplifier

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Descriptions:

> Fully balanced discrete Class A amplifier with 8 pairs of power transistors to ensure sufficient drive and control.

> Discrete devices are more flexible, allowing the parameters of each stage to be freely adjusted for optimal operation. It is also more developable and relatively controllable in terms of distortion, which allows for a greater variety of sound styles for different circuit configurations.

> THe power for the headphone amplifier can be switched off separately, making the device a pure preamp output.

> The preamp uses two direc-inserted LM49720 dual op-amps. The preamo outputs can be turned off for easy switching between headphone and speaker listening.

> The use of matrix relay volume, effectively ensure that the 4-way volume is consistent without bias.

> The input stage is fully balanced architecture. Single-ended to balanced circuit, allowing single-ended RCA inouts to benefit from fully balanced drive.

> High-speed, low-noise rectifier and main filtering using 4 Nikon nichicon capacitors.

> Low noise high current voltage regulator.

> Two 50W audio-specific custom torodial transformers, one for each channel, do not interfere with each other.

> Rigorous desgin, reasonable layout, tidy process and solid materials.


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Specifications:

Input:
> RCA x1: input sensitivity tyical: 2-3Vrms; input impedance 4KΩ
> XLR x2: input snsitivity typical: 4-6Vrms max 12Vrms; input impedance 8KΩ

Preamp output:
> RCA: 100Ω output impedance
> XLR: 100Ω output impedance
> Frequency response: 20-80kHz/-0.1dB
> SNR>123dB
> Crosstalk<-123dB @ 1kHz
> THD+N: <0.0002%
> IMD: <0.0003%

Headphone amp:
> Single-ended output (6.35mm) impendance: 0.05Ω
> Balanced output (XLR 4PIN or 4.4) impendance: 0.1Ω
> Frequency response: 20-80kHz/-0.1dB
> SNR 20-80kHz/-0.1dB
> Crosstalk<-120dB @ 1kHz
> THD+N: <0.0005% @ 9700mW into 32Ω LOAD
> IMD: <0.0005% @ 9700mW into 32Ω LOAD
> Maximum undistored power output: 6000mW into 32Ω LOad
> Maximum power output: 12000mW @ 32Ω (THD=1%)

Others:
> AC power input 100V - 240V (manually adjusted)
> Overall power consumption <30W
> Size W330mm*D260mm*H65mm (protrusion not included)
> Package size: W420mm*D360mm*H175mm
> Weight: 7.0KG (with package)

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