Tube input dynamic range, fast slew rate, open loop index and dynamic indicators is excellent, and make the sound soft sounds, especially the performance of the human voice is extremely rich in the tube to its full and sweet tone has been attracted by the warm transparent sound performance. 

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Product Features:

High quality liner power supply design; Tube buffer design; TE7022 +PCM1793 circuit design;  High quality Tube USB Sound Card; High quality Tube Headphone-AMP; Support Win7, Win8 ,Mac ,Ipad , Vista; Add the Headphone-amp output Gain adjust function

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Main Function :

1) High quality external Tube USB DAC.

24bit input , Win7 \Win8 \XP\Mac\Ipad\Vista Support , just plug and play.

2)High quality Tube Headphone amplifier.

T1 is a high quality headphone amplifier , the input range of analog or USB signal through separate headphone amplifier to drive your HIFI headphones , it can not only protect your headphone , also let you enjoy the music .

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More Detials :

New Modular design of circuitar chitecture.

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Modular functional design ,modules at all levels with independent power supply of high quality chips, and effectively avoid signal crosstalk between intimate delay protection design, delay access headphone and shutdown quickly disconnect completely avoid the imbalance of the switch machine instantly circuit DC output impact to protect your expensive headphones and speakers. 

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New Modular design of circuit architecture:

Modular functional design ,modules at all levels with independent power supply of high quality chips, and effectively avoid signal crosstalk between intimate delay protection design, delay access headphone and shutdown quickly disconnect completely avoid the imbalance of the switch machine instantly circuit DC output impact to protect your expensive headphones and speakers.

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Split power supply design:

Quality linear power supply, five-core external power supply interface, two-lane group, power supply, large-capacity power supply filtering, and more effective to reduce power supply noise.

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High quality component used:

Japan ALPSpotentiometer, German WIMA capacitors, four precision chip resistors, ENLA sound professional electrolytic capacitor, tube socket , USB port, RCA terminals are gold-plated material, full ON voltage regulator devices.

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Headphone amp Gain adjust design:

Headphone output gain adjust,  renewable headphone amp module.

T1 is designed with a output delay circuit , and it lets the tube been fully preheated before the output is opened.

Concrete steps : The tube filament will light after power on , then waiting 30seconds after the white lamp at the bottom of the tube is lit , then T1 is working. 
 

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Specification

Product : T1 24BIT TUBE USB DAC
Color : silver , black
Weight : 2KG
Size : 15.5*9.7*4cm 
Frequency response : 20hz-20khz
Signal to noise Ratio : >=120db  
Lint out : 2Vrms
Suitable headphone Impedance : 30ohm~600ohm
Headphone Amp output : (biggest is 20V) 32ohm--1000MW ,120ohm--400MW ,300ohm--150MW
Line out insider impedance : 100ohm
Headphone amp insider impedance :10ohm
USB support : 24bit/96kHz
Input jack : analog RCA jack*1 , USB jack *1
Output jack : analog RCA jack *1 , 6.5mm jack *1 Unpack : T1 24bit tube USB DAC ,power adapter(220/110V) ,PC USB cable , 6.5mm to 3.5mm stereo F adapter , User manual.

Headphone Amp part AP measured curves: (tube output test) 
 

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