Is this amp self biasing? Can it use upgraded tubes like 6550's?

If you are hoping to roll tubes, you will want to look elsewhere. But having said that, this is a nice little amp when paired with fairly efficient speakers.

does this amp have Bluetooth ?

The point of s tube amp it to preserve a high quality (hopefully analog) source. Connecting a Bluetooth source is pointless. This company gets it.

Would this amplifier support 350Bs with their slightly higher heater current requirements?

The amp will automatically adjust the bias so no need to do anything

Do you need to Bias this amp or is it self biasing?

The amp is self-biasing therefore there are no bias adjustment pots on this amplifier.

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Reisong A12 EL34 12AX7 (ECC83) Hi-Fi Audio Stereo Single-end Class - A Tube Amplifier Amp

Reisong A12 EL34 12AX7 (ECC83) Hi-Fi Audio Stereo Single-end Class - A Tube Amplifier Amp

Product ID: 279796549

Details

Brand
BOYUURANGE
Color
Black
Compatible Devices
Speakers
Material
Metal
Output Wattage
6 Watts

💡EL34 & 12AX7 Tubes Included

🔊6W Class-A Power Output

🎛️Point-to-Point Hand Welding

$1279.18

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Description

🎶 Elevate your sound game with vintage warmth and modern precision!

HANDCRAFTED EXCELLENCE - Point-to-point hand welding ensures superior build quality and authentic tube amp warmth.
SLEEK DURABLE DESIGN - Robust metal enclosure with a protective tube cage blends vintage charm with modern reliability.
VERSATILE TUBE COMPATIBILITY - Supports multiple tube replacements without converters, giving you customizable sound options.
AUDIOPHILE GRADE SOUND CLARITY - Experience warm, rich tones with precision thanks to the upgraded EL34 and 12AX7 tubes.
OPTIMIZED FOR BOOKSHELF SPEAKERS - Designed specifically for speakers with 89dB+ sensitivity to maximize audio fidelity.

The Reisong A12 is a Class-A single-end tube amplifier featuring EL34 and 12AX7 tubes, delivering 6 watts of pure, warm hi-fi audio. Hand-welded for audiophile-grade quality, it’s optimized for bookshelf speakers with 89dB sensitivity or higher. Its versatile tube compatibility and durable metal enclosure with a protective tube cage make it a stylish and reliable choice for discerning music lovers and professionals seeking authentic tube sound.

Specifications

ASIN	B08SWK24QJ
Amplifier Type	Tube
Best Sellers Rank	#253,540 in Electronics ( See Top 100 in Electronics ) #1,463 in Audio Component Amplifiers
Brand	BOYUURANGE
Color	Black
Compatible Devices	Speakers, Guitar, Keyboard
Connector Type	3.5mm Jack
Customer Reviews	4.0 4.0 out of 5 stars (66)
Enclosure Material	Metal
Item Dimensions D x W x H	10.55"D x 12.2"W x 6.5"H
Item Weight	11 Kilograms
Manufacturer	BOYUURANGE
Mfr Part Number	Reisong A12
Model Name	Reisong A12
Model Number	BOYUURANGE Reisong A12
Output Channel Quantity	2
Output Wattage	6 Watts
Power Source	AC

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