Model no:   QA-115-REG-Mk2

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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.

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.

(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 : (FREE with new orders, limited time offer !! SAVE $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

sold-oak chassis add C$150

Super high gloss piano solid-oak finish add C$500

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