Designer Series Amplifiers

Model no: QA-1003 (Designer Series)
$3,380 Direct Order Price

Line Stage Full Balanced 12AX7/12AU7 + 5U4G + Regulator Tubes  Super Hi-End Pure Tubes Pre-Amplifier

This is our third "Designer series model of pre-amplifier. In this series of products there is no compromise in either sound quality or external appearance, we have done our best to make this product look great without loss of sound quality. That is the purpose of this special series of product line. Of course the cost is slightly higher due to a more complicated chassis design, but you will find it is a tremendous value. The photos show the metallic look of the chassis for this model, you will find it hard to believe it is an all MDF wood chassis. The use of wood in tube gear chassis manufacture is sometimes preferable as every tube exhibits microphonics, they will pick up their surrounding's vibration pattern. Wood construction is the best way to alleviate vibration pick-up, so we use MDF as the chosen material. At the same time some people prefer the look of metal, so we try very hard to make a wood chassis which exhibits this appearance. This state-of-the-art manufacturing process is reflected in this series of products.

This pre-amplifier uses a no-negative-feedback design, so an open sound stage and airy feeling can be achieved. At the same time a very special circuit design and fine-tuning technique is imbued to this unit to make the small tubes sound like a big tube (big tubes sound more natural and real in some instances) but still retain the advantage of small tubes (which is pin-point focusing and tighter bass control) . So with this pre-amp you can have a RICH, SWEET, OPEN, AIRY, GOOD FOCUS and TIGHT BASS PUNCH in one unit.

This model is equipped with a 5U4G vacuum tube rectifier and tube regulator in the power supply section to get richer and warmer sound with good bass control. This unit comes with a Stand-By switch which can let you enjoy the music anytime without warm-up.

This unit features both XLR balanced or RCA single-ended input and output capability, the circuit is our very special copyright design, which can show a significant improvement in focusing, dynamics, depth, and width of sound stage by employing the input or output XLR balanced connections. For most other products in the market you must use both input and output XLR balance connections to get the balanced amplification’s sonic improvements. Of course you can just use RCA input and output for this pre-amp , and the performance will still be better than those products asking over US$15,000 in the market we believe. Experience this wonderful product for yourself and you will know we are not just talking.

This unit is all component-to-component hand-wired, employs no transistor regulators or printed circuit board, so the best open and natural ORGANIC sound quality is ensured. Satisfaction as always is guaranteed.

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.

Specifications
No. of inputs 1 set of XLR balanced inputs, 2 sets of RCA inputs
No. of outputs 1 set of RCA and XLR balanced pre-amp outputs , 1 set of record outputs
Freq response 1Hz - 150Khz (-3db)
S/N better than 90 db
Gain x5-x10 depending on the gain of the tubes
Phase 180deg inverted
manufacturing hand-wired point to point
Tubes used 12AX7(default) /ECC83/5751/12AU7/5814A/ECC82/ECC81/12AT7 x 6

5U4G(default)/ 5AR4/5R4WGB/53KU

Negative feedback none

1 year free parts and labor warranty under normal operation conditions, shipping extra



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