Pre-Amps - Classic 100 Series

Model no:   QA-115-REG-Mk3
C$3,680 Untitled Document [US$ 2944]

line stage full balanced pre-amplifier with all tube regulator

Using the 6SL7 tube as the amplification, and 6L6G tube as the output buffer section, this unit is built with a 5U4G tube rectifier and an all tube regulated power supply section(which gives you the best price performance fully balanced pre-amplifier). All hand-wired to the highest possible standard. Employing a totally non-negative feedback design, this unit offers the most organic open and airy sound that can be achieved.

This pre-amp offers tight and punchy bass control, a rich and sweet mid range, open silky and airy highs in one single unit. It is also superbly quiet due to it regulated power supply.

Not a single transistor was used in this very specially designed unit, so a superlative tube sound can be achieved. You will experience a super open/warm/rich/airy/smooth tonal quality and sonic performance. Experienced by your own ears, you will just love it immediately! This unit is suitable for almost any type of music with exemplary performance.

MDE (micro-dynamic extraction) upgrade for an additional cost of $400, enhance micro dynamics with super low background noise, effortlessly surface out musical information originally immerse below noise floor.

Switchable inductor for an additional cost of $200 , select between regular and lengthen decay of music notes.

Now available with a super rectifier tube up-grade for the 5U4G, this can greatly enhance the dynamics, high and low frequency extension and bass punch. A Stand-by switch for pre-heating of the rectifier tube ensures the longest lifetime operation. Rectifier tubes are replaceable with high quality ceramic sockets installed.

The 5U4G tube rectifier can further upgrade by our super rectifier STR-104 or higher models , 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 and 1 set of XLR balanced inputs
No. of outputs 1 RCA and 1 XLR balanced pre-amp outputs , 1 set of record outputs (or 2nd pre-out)
Freq response 2Hz - 100Khz (-3db)
S/N > 90 db
Input impedance 82Kohm (option: from 10Kohm to 1Mohm)
Gain x3 - x8 depend on tubes
Phase 180deg inverted (option: non-inverted)
manufacturing hand-wired point to point

2 x 6SL7(Alt: 6SN7/6SU7/ECC32/ECC33/ECC35 or equiv)

+ 2x 6L6G

(Alt: 6V6/6K6/6G6/6F6/EL34/5881/6550/KT66/KT88/KT99/KT100 or equiv )

+ 5U4G (alt : 5AR4/83/274B/53KU/5R4 or equiv)

+ 6AS7G (or 6080)+ 6SK7+ 0C3(or 0D3)

(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 : (+ $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.

Additional Upgrade option:

add 0/180 deg phase control switch with additional of C$150

solid-oak chassis add C$250

Super high gloss piano solid-oak finish add C$600

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

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

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