Pre-Amps - Classic 100 Series

Model no: QA-111-Mk2
C$680 Direct Order Price

QA111-3.jpg (109464 bytes)

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 2nd 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.

The Lowest photo set shows enhanced transformer power supply version in solid Aluminum chassis .

Feedback from genuine customers:

From Dr. Soo

It basically sounds just fine straight out of the box.  It's on my secondary system, hooked up to a Cary Audio SLA-70 amp (with upgrade to run 6550/KT88 drivers).  The sound stage is well defined and deep, with warm sounds, good clarity, agility, and dynamic range on my Sonus Faber minima speakers.  I was wondering what valves it will come with and am very pleased to see the long cage Mullards.


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

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 upgrade price below is a special deal for new orders only, modification of previously built unit will be around $300 higher than the following prices due to more works needed 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

Enhanced transformer version add C$50

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

0/180 deg phase switch add C$100


1 year parts and labor warranty under normal operation conditions
standard chassis : Gold/ Black/Metallic MDF , Aluminum chassis

(optional chassis : Mirror steel, solid-oak )

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