www.space-tech-lab.com

Model no: BUF-002
All tube buffer amplifier with RCA-balance converter
This is our basic model of unity-gain buffer amplifier with XLR balanced output capability. It will convert any CD player or DAC into a balanced output tube DAC / CD player  . With this buffer, the output impedance of any high impedance output will be converted into a lowered output impedance , greatly enhancing the output driving capability .The signal will become more transparent, airy and dynamic for a much more natural sound. 
Specifications
No. of inputs 1 sets of RCA input
No. of outputs 1 set of RCA output + 1 set of XLR output
Freq response 1Hz - 200Khz (-3db)
S/N better than 90 db (full output level)
Gain x 0.9
Phase non-inverted
manufacturing hand-wired point to point
Tubes used 2 x 12AX7/12AU7/5814A/ECC83/ECC85/12AT7
(Optional 6DJ8 / 6922 / ECC88 / ECC188)

(Note: The price quoted is a special deal for newly order unit only, modification of existing unit will be around $300 higher than the following prices due to more works for disassemble of the original circuits)

Level 1 upgrade : (+ C$200)

Special designed "Super-Drive" circuit, output impedance lowered to 200ohm (can drive any input from 600ohm up to infinity) with better bass control and punch , better definition and improved in overall tonal quality. By adding this upgrade, it sounds like the output with 10 times tubes being used. With this level of upgrade, just add $50 and you can have a headphone output with enough power and current to drive your headphone directly.
1 year limited warranty, tubes 90 days under normal operation condition
standard chassis : Gold/ Black/Metallic  small  chassis

(optional chassis : Mirror steel, black piano , solid-oak , aluminum )