BEZ Q3D-3 preamplifier

This innovative pre-amplifer is designed by BEZ chief engineer Qingxin Huang. It has extremely high accuracy power regulation and it is the prerequisite for its high quality sounds.The circuit of this preamp was modified base on an American circuit.


The improvements by using active or passive transmission-line transformers(TLT) 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;

Soundstage and resolution are much better than RC coupling circuit;


What is inside:

Output transformers: high quality American signal transmission-line transformer for military used (balance and unbalanced).


Power transformer: BEZ made 150WA5

BEZ made
Power Transformers

Available for tubes
(screening layer between primary and secondary)
Steel Sheets width× lamination (mm)


Size (mm)


Blue shell ALPS dual gang potentiometer volume controller.

High quality American made oil-immersed capacitors coupling.

Use Chinese oil filled capacitors as power filter, quality of sound is much better than normal electrolytic capacitors.



BEZ Q3D-3 preamplifier gallary








Signal amplification: 12AU7 x 2; replacement: ECC82/5963/5814/12AT7/ECC81

Stabilivolt: 2A3B x 1, replacement: 300B/2A3/2A3C

Voltage amplification: 6C5P x 1, could be replaced by 6J5/6C5

Benchmark: WY2P x 1, replacement: OA3

Rectifier: 5Z3P X1 can directly change 5Z2P/5Z4P/5Z3PAT/5U4G/U52/5Y3/5V4


Technical Data:

Input Impedance:50K

Output Impedance:600Ω(balance or unbalance)

Frequency Response: 20Hz - 40kHz(±1dB)

S/N Ration: 100db

Distortion: less than 0.2%

Voltage Gain:15dB

Power consumption:56W

Two pairs RCA Inputs.

Wood front panel, stainless chassis. Dimensions: (cm) 23X49X16.

Net weight: 10 kg, with package 14 kg.

For more information, please contact us: [email protected]


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.