Q3A-1 pre-amplifier

The benefits of using active or passive transmission transformers as output:
Stable circuit impedance in all range frequency;
Eliminate the undesirable digital sound from CD player;
Modify the mid/highs and shows quite good performance
Powerful bass;
Density of sound and resolution are much better than RC coupling circuit.


What is inside:

High quality American signal transmission-line transformer for military used (balance and imbalance).


American WEST capacitors, best for audio use.


Blue shell ALPS dual gang potentiometer volume controller.



Technical Data:

American transformers, imbalance or balance output

Signal enhance 6DJ8 X 2, can be replaced by


Stabilivolt:WY4PX1, can be replaced by VR150/OD3

Rectifier tube:5Z2P X1, can be replaced by 5Z4P/5Z3P/5U4/U52/5Y3/5V4

Western Electric TRW capacitors coupling. ALPS blue shell 21 gears double potentiometer volume controlling. Three gears input controlling.

inductance filter, high-end 304 stainless steel plate, 110V-220V voltage switch.

Technical Data:

Input impedance: 50K

Output impedance: 600 ohm (balance or imbalance)

Output voltage: 4V (Maximum 6V) Tips:Please check out the input sensitivity of your power amp

Frequency Response: 20Hz-40KHz(+ -1DB)

S/N Ration: 100db

Distortion: less than 0.2%

Gain: 10 db

Power transformer: 80W

Net weight: 7.3KG

Gross weight: 9KG


BEZ is an amplifier audio supplier. After establishing the team in 1997, BEZ quickly became a well-respected maker of amplifiers in China. We carefully select components in order to contribute to sounds qualities. These components could be new or used. The used components mainly come from military and they have outstanding performance on sounds. We measure, test and experiment our collections to provide more ways for hobbyist to enjoy music.



We use DHL/UPS/Fedex/EMS.

Item located at china warehouse and item will be ship from China.

Items will be posted within 3 business days after payment confirmed.

A tracking number will be provide to customer so customer can review where is the item till it will be delivered.

Once receive the package please check whether the amp is good or broken.

Please contact for any inquiries before the purchase - [email protected]


Return policy:

If the item shows up defective or damaged, please email us immediately.

We offer 1 years warranty for the amp (3 months for tubes).

Defective situation must be reported to seller within 14 days upon receipt.

Returned packages displaying an invalid or expired will not be accepted.

Returned item should be in its original box with all packing materials and shipped to us via traceable means.

We carfully inspect returned items upon receipt before issuance of refunds or exchanges.

Shipping and handling charges, insurance are not refundable in any case.

Buyer bears all shipping charges.

We are no responsible for any consequences if the amp has been modified and changed by customers.

If you have any question regarding the products and service, please email us through eBay system before you leave feedback. We will try our best to solve the issue with you.