QA-112-Ultra C$2,880
Untitled Document
[US$ 2304]

pure tube organic line stage pre-amplifier with 274B tube rectification, quad core balanced output transformer, oil coupling capacitors
Using the most common 6SL7/6SN7 tubes in the amplification section, this pre-amp is built with a 274B 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 also inplimented our famous component-to-component and point-to-point hand wiring technique, as well as our non-feedback organic pure tube sinigle-ended class A design, it can gives you exceptional super natural and open airy sound stage which other manufacturers no way to compete with.
We strongly believe the sonic performance of this unit easily surpass those products selling over US$ 8~10K in the audio industy
This pre-amp can use more than 10 different models of tubes (ECC35,ECC32,ECC33,6SN7,6SU7,6188,6SN7,6SL7,6SU7,5691,5692...etc) 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 ( only possible with Enhanced or Super version, and one of the tube in the adapter must be 6G6G)
The 274B tube rectifier can further upgrade by our super rectifier STR-104 or higher models, direct plug and play without any mod required.
Individual output gain control to match any power amplifier without sacrify performance, it can also use to match uneven room acoustic or NOS tubes with unmatched gain

With this super rectifier adaptor, you can use 300B, 2A3 , 45 , 50 , 80, 83, 1616 , 3B28 or 866A as rectifier tubes option. Specifications
No. of inputs |
2 sets of RCA inputs |
No. of outputs |
2 setsof pre-amp outputs (1 set RCA direct tube out, 1 set RCA+XLR transformer out) |
Freq response |
5Hz - 100Khz (-3db) (direct tube out) / 10HZ ~50Khz (-3db) (transformer out) |
S/N |
better than 85 db |
Input impedance |
82Kohm (option: from 10Kohm to 1Mohm) |
Gain |
x3 - x6 depending on tubes |
Phase |
180deg inverted (direct) / non-inverted (transformer coupled) |
manufacturing |
hand-wired point to point |
Tubes |
2 x 6SL7 (option: ECC35/ECC32/ECC33/6SN7/6SU7/6188/5691/5692..etc) + 274B |
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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.
Additonal up-grade options:
0/180deg output phase selector add C$150
solid-oak chassis add C$200
solid-wood side panel add $80
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