Pre-Amps - Classic 100 Series

Model no: QA-113-Mk3 / QA-113-Mk3-Super
C$1,380 Untitled Document [US$ 1104] / C$1,680 [US$ 1344]


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  solid-oak+plexiglass overlay

line stage balanced output pre-amplifier

Using the 6SL7/6SN7 as the amplification and 6L6G as output buffer section, this unit features superlative mid-high sound, built with a 6X5 (or 5U4G for super version) tube rectifier. This gives you the best ST size tube sound with a low price. All hand-wired to the highest possible standard. (older version use 6G6G as input tubes, you can ask for this older option with no additional cost)

Organic pure tube non-feedback design, as well as with our copyrighted FLEX-TUBE design, you can put in over 10 different type of tubes as output and fine-tune the sound to your deisre. The front tube can chagne from 6SL7 to 6SN7 or 6SU7 and their equivalents., which will alter the gain as well as sound qualities. A total of 6 x 10 = 60 tube combinations can be used in this pre-amp, plus the vast selection of rectifier tubes for the super version upgrade.

Super Version include the following upgrades:

- 5U4G tube rectifier upgrade (can use 274B, 5R4, 5AR4, GZ32, 5V4, 53KU...etc, with 4pin to 8 pin converter, you can even use 80, 83.....etc)

- Enhanced power supply circuit and Tx upgrade

- Alumimum hybrid chassis upgrade

- Able to use EL32 and compatible tubes upgrade

IR motorized remote volume control add $180


The 6X5/5U4G tube rectifier can further upgrade by our super rectifier STR-104/ STR-1001 / STR-1002, direct plug and play without any mod required.

With this super rectifier adaptor, you can use 300B, 2A3 , 45 , 50 , 80, 83, 1616 , 3B28 or 866A as rectifier tubes option.

No. of inputs 2 sets of RCA inputs (Max. input level 2Vrms)
No. of outputs 1 set of RCA and balanced pre-amp outputs , 1 set of record outputs (optional: rec out >> pre-out)
Freq response 3Hz - 40Khz (-3db)
S/N better than 85db
Input impedance 100Kohm (option: from 10Kohm to 1Mohm)
Gain x3- x6 depend on tubes
manufacturing hand-wired point to point

2 x 6SL7 (alt : 6SN7 / 6SU7 / ECC32 / ECC33 / ECC35 / 5691 / 5692 ....etc) (option: 6G6G x 2)

+ 2x 6L6G (alt: 6K6/6V6/6Y6/6F6/5881/6CA7/EL34/6550/KT66/KT77/KT88/KT99/KT100...etc )

+ 6X5 (alt: 6X5G) / upgraded to 5U4G (alt: 274B/5AR4/5R4/GZ32/GZ33/53KU...)for super version

(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.


Additonal up-grade options:

0deg / 180deg inverted phase switch add C$150

Solid oak chassis add C$200

Plexiglass top overlay add $100

Wide Aluminum chassis add C$100

super deluxe solid-oak chassis with super hi-gloss piano finish add C$500

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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