If I don't want treble or bass gain, how should I use the knob?

The bass and treble knobs can work from left to right and the range is ±6dB. If you don't want gain change, please turn the knobs to the 12 o'clock direction.

Will this work with my bluetooth turntable (Angel Horn)?

If the output is phono yes, however, the unit doesn't come with Bluetooth.

Do the headphone port and RCA output at the same time?

Hello. It will output at the same time. Accodring to our customers' needs, we will cancel this feature in the future. And you will be able to listen to your headphone alone and won't disturb others.

Power Source	Corded Electric
Output Channel Quantity	2
Amplifier Type	Tube
Connector Type	RCA, 3.5mm Jack
Compatible Devices	Record Player, Turntable, Amplifier, Headphone, Active Speaker
Output Wattage	1 Watts
Item Weight	13.6 ounces
Item Dimensions D x W x H	3.62"D x 6.02"W x 0.98"H
Material Type	Metal
Color	Black

A1 Tube Phono Preamp: Valve Headphone Amp, Hi-Fi Audiophile Preamplifier for MM Turntable Record Player with Tone Control for Home Stereo Audio System

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