Model no: QA-112-Mk2

Using the most common 6SL7/6SN7 tubes in the amplification section, this pre-amp is built with a 6X5 tube rectifier which gives you the best medium size tube sound with a low price. The sound is very liquid, dynamic, rich and warm with high definition. This is an all hand-wired state-of-the-art pre-amplifier.

This pre-amp can use more than 10 different models of tubes to fine-tune the tonal quality as well as dynamics and richness, with additional tube expansion adapters, even can use 6L6, 6K6, 6G6, 6V6, 6F6, 6Y6,KT66,6550, EL34, 5881, KT88, KT99, KT100...etc

The 6X5 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 : (+ 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 resolutions.

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:

0/180deg output phase selector add C$150

solid-oak chassis add C$150

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