FXAUDIO TUBE03 MKII Tube Preamplifier

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Regular price $69.99 USD
Sale price $69.99 USD Regular price
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To minimize the interference to the sound, the power part are completely separated from the audio part.
With treble/bass adjustment and mini compact size, it can bring you much fun and convenience.
It is made of aluminum alloy material and the headphone preamplifier is durable and reliable to use. The signal switching adopts relay switching, which is better than the common analog switchover switch.
The length of the product is 14.8cm, the width is 9.8cm, the height is 3.3cm.
It has a wide applicability and can be used for living room, study, office, etc. The products adopts replaceable design in the tube so you can use better tubes for upgrading such as 6JI, GE5654, etc.

Due to the light and screen setting difference, the item's color may be slightly different from the pictures.
Please allow slight dimension difference due to different manual measure.

Shipping Fees

Worldwide Free Shipping on SHENZHENAUDIO, Please allow 1-3 business days for conduct Quality Control in order to ensure the products quality.

If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.

Which Couriers To Use?

Given the amount of shipping partners we work with and the vast coverage area we serve, there are likely regions with much longer transit times than others. If you have any feedback, suggestions, or problems with the courier of your shipment, please feel free to submit a support ticket via the "Contact Us" button below.

Our goal is to provide our customers with the best shipping experience possible at a reasonable cost. This is why we constantly negotiate with existing shipping partners for lower rates and actively test new couriers for potential opportunities.

PO boxes or APO/FPO

The ability to ship to PO boxes or an APO/FPO address depends on the item's weight. If an item weighs more than 9 pounds, we won’t be able to ship to these addresses because of our current courier agreements.

To determine if your order is eligible for shipment to PO boxes or an APO/FPO address, please contact SHENZHENAUDIO Support.

Estimated Delivery Time

For customers in the continental United States:
5 to 14 business days from the date of shipping

For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:

Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping

Please keep in mind that these are rough estimates and shipments can be delayed due to unforeseen circumstances, like postal strikes or severe weather.

If, for some reason, you don’t receive your order within the estimated time frame provided above and suspect that it might be lost in transit, please submit a support ticket from your transactions page and we can look into the order with the courier. Lost-in-transit requests must be submitted to SHENZHENAUDIO Support within 4 months of the date of shipping or before the courier archives the tracking information.

Easy 30-Day Return Policy

If you are dissatisfied with your purchase for any reason, you may return it to SHENZHENAUDIO within 30 days of the received date, subject to the conditions and exclusions below.

Eligibility Conditions

Please read conditions below. If all conditions are not met, SHENZHENAUDIO reserves the right to refuse the return. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. SHENZHENAUDIO can only refund the original purchase price. Shipping and handling fees are nonrefundable.

Defective or Damaged Items

Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.


Depending on where you live, the time it may take for your exchanged product to reach you, may vary. Please allow 3-5 business days for mail-in exchanges to be processed.

Refunds & Credits

Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase. Please note: we can only refund the original purchase price. Shipping and handling fees are nonrefundable.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.


To return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China

If you’ve done all of this and you still have not received your refund yet, please contact us at support@shenzhenaudio.com.

Material: Aluminum Alloy
Model: Tube-03MKII
Bluetooth Version: 5.0
Main Chip: QCC3034+ESS9023+6K4+NE5532+JRC4556
Frequency Response: (±3dB)20Hz-22KHz
Input: BT5.0 APTX RCA
Output: RCA 3.5mm Amp Output
Signal to Noise Ratio: 100dB
Distortion Rate: 0.001 Percent
Output Impedance: Up to 600R
Headphone Output Impedance: 16-150R
Line Input Impedance: 600R-20K
Headphone Power Output: 30mW@16R, 50mW@32R, 70mW@68R, 70mW@150R
Sensitivity: 0.775Vrms
RCA Output Level: 2Vrms
High and Low Gain: ±8dB
Power Supply: 12V 1A
Features: High Performance, High Stability, Adjustable
Size Details:
14.8cm x 9.8cm x 3.3cm/5.83" x 3.86" x 1.3" (Approx.)


1 x Headphone Preamplifier
1 x Power Adapter
1 x Amplifier Antenna
1 x Audio Cable
1 x User Manual