Pre-Amps - Advance 10000 series

Model no: QA-10008
C$16,880 Untitled Document [US$ 13504]


line stage balanced input and output tubes pre-amplifier with 100 micro-step volume control + 872A x 2 super rectifier + selectible choke + pure tube regulator + HT auto bypass + Universal tube design + Low output impedance power drive

This is our 2nd top-most best sounding all vacuum tube pre-amplifier with RCA and XLR balanced inputs and outputs with sonic performance that easily out-perform preamps in the market for almost any price range.
We employ the organic way of designing and manufacturing that has zero negative feedback, no circuit board for tube sections, hand-wired component to components and point to point, Lots of oil capacitors, NOS carbon composite resistors , and high grade ultra heavy-duty transformer and power filter capacitors. This unit is hand-built with no compromise in component quality, very carefully fine tuned for tonal balance, resolution, sound quality, air and soundstage for a pure effortless delivery. All the good sounding options have been integrated into this very special design which almost none of other manufacturers can come even close to.

The end result of our no compromise design and execution is articulation and punch in the bass section with exception of elasticity and tenderness, sweetness and liquidity in the midrange with syrup-like feeling but not sticky, super silkiness and openness in the high frequencies without boundary. 
Because we could not find an ultra high performance remote volume pot, we built our own 100 micro-step remote controllable volume control non-contact, non-semiconductor super high grade volume pot with proprietary software. The volume pot can select between "DUAL VOLUME" mode or "VOLUME + BALANCE" mode by the toggle switch in front panel, the music signal passes thru no switch contact point and no solid-state devices, extreme pure and transparent sound.

The power supply section uses two super rectifier tube 872A to form an organic full wave rectifier , along with a T/D switch to be able to add the touch of diodes when needed. There is 5/10V rectifier filament voltage selection, so even 845 , 805 and 211 can be used in this unit . Pure tube regulators with not a single solid-state device ensure most purest and natural but well controlled full range performance.

A big choke can be selected as a presence or bypass for different pace of music regeneration, Hi / Lo gain setting selection for high / low gain power amplifier matching.

Super low output impedance drive circuit included , easily drive over 10 power amplifiers without any audible degradation, and give out super good bass punch and tenderness. 


No. of inputs 2 set of  XLR balanced  inputs, 2 set of RCA inputs
No. of outputs

1 set of RCA and three sets of XLR balanced pre-amp outputs

Input / Output impedance Input = 82Kohm (optional : 10K -- 1Mohm) Output = 200ohm
Freq response 1Hz - 100Khz (-3db)
S/N > 80 db
Gain x5 - x10 depend on tube types
manufacturing hand-wired point to point for tube section, digital display section use circuit board
Phase 180deg inverted for XLR1 , non-inverted for XLR2 and 3

1st stage : 6SL7 x 2 (alt: 6SN7/6SU7/ECC32/ECC33/ECC35/6188 or eq) + 12AU7 x 2 (alt: 12AX7/12AT7/ECC81/ECC82/ECC83)

2nd stage: 6G6G x 2 (alt: 6Y6/6F6/6V6)

3rd stage: 6L6G x 2 (alt: 6V6/6L6/6K6/6Y6/6F6/6G6/EL34/6CA7/5881/6550/KT66//KT77/KT88/KT99/KT100)

Rectifier : 872A (alt: 845/805/211)

Regulator : 6AS7G/6080 + 0C3/0D3 + EF86/6267


1 year free parts and labor warranty under normal operation conditions
standard chassis : Gold/ Black/Red-brown/Blue/Green/Silver MDF chassis
(optional chassis : Aluminum, Mirror steel, solid-oak ,black piano)

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