Pre-Amps - Classic 100 Series

Model no: QA-118-SP (QA-118-Reg)-Mk2

C$5,880 / C$6,880 Direct Order Price

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Various types of Super rectifier up-grade possible,

please check our Accessories Section

or click here ACCESSORIES

This is our top model of 1xx series, which comprises a totall of 11 tubes (REG version 14 tubes) to make this a superior performance pre-amplifier. The total tube rolling combination has more than 120,000 possibilities. The first row of tubes use very high grade Mullard EL32(CV-1052) as the front end amplification stage, it can also be replaced with: 6G6G/6L6G/6V6G/6K6G/6F6G/6Y6G/EL34/6550/KT66 and their equivalents. This section contributes about 40% of the tonal quality of the whole pre-amp. 

Then the 2nd stage uses NOS 6G6G as the intermediate amplification section, which also can be replaced with 6L6G/6V6G.......etc. This section contributes around 20% of the overall tonal quality.

Then the 3rd stage is the high current output stage, which uses all the 6G6G/6Y6G.....KT88/KT100...etc, and the special part is they can use mixed tubes, which means for example you can use two 6L6G to work with two KT88 in this section. Then you can easily get both tube type's tonal character to fine-tune your system.

The tube rectifier uses a standard 5U4G, and a diode/tube selection switch is featured to let you choose between (pure tube)/(diode+tube)/(diode only) rectification. There is another switch which can set the music regeneration pace to faster /standard response. With these capabilities and special switches you can adapt to any music type. ie, classical music, instrumental, opera, vocal, country, jazz, blues, pop, rock, new age...etc.

This superlative unit can easily surpass any competitor’s pre-amp by using the right tube combinations. For the greater the flexibility in fine-tuning, the higher the chance to approach perfection. You will find that those other pre's in the market with their overinflated prices can't begin to give you the flexibility we offer in this stellar component.

This pre-amp uses the purest ORGANIC design, no negative feedback, no circuit board(PCB), no transistors, all component-to-component hand wiring, built with very high grade selected components. It also features fully balanced input and output capabilities.

The uppermost photo set is the standard version in a black metallic MDF chassis.

The lower photo sets shows the ultimate version with a NOS super heavy duty Tx, all tube regulator with NOS filter capacitor, 0/180deg phase selector, beautiful solid-oak chassis with copper foil shields inside. Cabinet size 19.5"W x 16"D. (additional C$2,000, model : QA-118-Reg)

Now available is a super rectifier tube up-grade for the 5U4G, which can greatly enhance the dynamics, high and low frequency extension, and bass punch. A stand-by switch for pre-heating of the rectifier tubes 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.

No. of inputs 1 set of XLR inputs and 2 sets of  RCA inputs
No. of outputs 1 set of RCA and 2 sets of balanced pre-amp outputs , 1set of record outputs
Freq response 1Hz - 150Khz (-3db)
S/N > 85 db
Gain x3- x8 depend on tubes
Phase inverted (option: non-inverted)
manufacturing hand-wired point to point/comp-to-comp
Tubes 4 x EL32 (alt: 6G6G/6L6/6V6/6Y6/6K6/6F6/KT66/EL34/6550/6CA7)

2 x 6G6G (alt: 6L6/6V6/6Y6/6K6/6F6/KT66/EL34/6550/6CA7/KT88/KT99/KT100..etc)

4 x 6L6G (alt: 6G6/6V6/6Y6/6K6/6F6/KT66/EL34/6550/6CA7/KT88/KT99/KT100..etc)

1 x 5U4G (alt: 5Y3/5AR4/274B/53KU/5R4...etc)

(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

solid-oak chassis add C$250

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


1 year parts and labor warranty under normal operation conditions
standard chassis : Gold/ Black/Metallic MDF , Aluminum chassis

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

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