specification of QA-111

Model no: QA-111-Mk2

line stage pre-amplifier

Using the most common 12AX7/12AU7 / 6DJ8 / 6922 as the amplification section gives you the best small tube sound. With such a low price, it is still all hand-wired to the highest possible quality. For a richer and warmer sound please choose the 6DJ8/6922 type of tube. For better dynamics please choose the 12AX7/12AU7 type of tube.

The upper left photo shows a special version with enhanced Tx, solid-oak chassis and solid brass volume knob

The lower photo set shows a special "G" version with Black MDF and a gold trim and socket as well as a solid gold plated knob.

Specifications

No. of inputs	2 sets of RCA inputs (Max. input level 2Vrms)
No. of outputs	1 set of pre-amp outputs , 1 set of record outputs
Freq response	2Hz - 150Khz (-3db)
S/N	better than 85 db

Gain	x5 - x10 depending on tube
Phase	180deg inverted (optional : non-inverted)
manufacturing	hand-wired point to point
Tubes	2 x 12AX7/12AU7 or 2 x 6DJ8/6922 ( made to order with the tube you want)
Input impedance	68Kohm (option: from 10Kohm to 1Mohm)

(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 power amp inputs 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 pieces of power tubes being installed . With this level of upgrade, just add another $50 and you can have a headphone output with enough power and current to drive your headphone directly.

Level 2 upgrade : (+ C$500)

Level 1 upgrade + Enhanced input circuit design with increase of max. input levels , further lowering of distortion and increase dynamics, as well as better air and openness . Enhanced components quality for better sonic reproductions with higher resoltuions.

Level 3 upgrade : (+ C$800)

Level 1&2 upgrade + Upgrade power supply with bigger transformer and stronger filtering circuit as well as enhancement in components for further sonic enhancement with more 3D holographics soundstage.

Level 4 upgrade : (+ C$1000)

Level 1&2&3 upgrade + Enhanced transformer with 5U4G tube rectifier for better air , smoother and sweeter sound quality

Additonal up-grade options:

solid oak chassis add C$150

'G' version add C$200 (Black lacqor chassis + all gold plated parts )

0/180 deg phase switch add C$150

1 year parts and labor warranty under normal operation conditions

standard chassis : Gold/ Black/Metallic MDF , Aluminum chassis

(optional chassis : Mirror steel, solid-oak )