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NOTE: This is a preamplifier, not a power amplifier or phono preamp, can't be used for turntables or passive speakers.
RCA input to the computer, CD, phone, iPod and other player and RCA output to the digital amplifiers, active multimedia audio devices for lossless audio(The RCA cables not included).
Small compact design, with optimal integrated circuit to get powerful, dynamic and sweet sound. Tubes can be replaced by 6K4,6AK5,EF95, 5654,403B tubes.
This pre-amp improves everything detail, transparency, immediacy, richness, tone associated with your music.
Built-in Switch impact protection circuit and overheat protection circuit, long life span of this unit. All aluminum alloy shell and come with a 24 month manufacturer's warranty.

Product Description

Tube Preamp

Our Story

Fosi Audio was founded in 2017. We are relatively new in audio equipment games, but we have mastered the art of producing high-quality audio products over the years. Our items are designed to deliver HiFi sound, irrespective of the space they are used in.

Our products are easy to use and offered at affordable prices. Fosi Audio is committed to providing the best audio experience to its valuable clients.

6K4 Tube Preamplifier

Product Parameters:

Power Adapter Output: 12V/1A
Product Adapter Input Voltage Range: AC 110V - 240V
SNR ≥ 98dB
THD ≤ 0.1%
Treble adjustment range: ±6dB
Bass adjustment range: ±10dB
Input Mode: RCA
Frequency Response: 20HZ -20KHZ((±3dB)

Enhance Your Audio with Tube Preamp featuring Controllable Bass and Treble

Experience a significant improvement in sound quality with this preamp! Enjoy a warm and smooth audio experience with exceptional clarity and depth.

Elegantly Designed Preamp with Intuitive Features for Effortless Use

Connect the Fosi Audio P1 with ease to your power amplifier or active speakers, without the need for any software installation or changes to settings.

Superb Audio Quality with Dual 6K4 Vacuum Tubes

Experience powerful, dynamic, and sweet tube sound with the Fosi Audio P1 preamp! Utilize any of the following vacuum tube models for optimal sound quality: 6J1, 6AK5, EF95, 5654, 403B, and more.

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Customer Reviews	4.1 out of 5 stars 580	4.5 out of 5 stars 2,381	4.4 out of 5 stars 1,118	4.3 out of 5 stars 331	4.5 out of 5 stars 646	4.4 out of 5 stars 110
Price	$71.98$71.98	—	$39.99$39.99	$69.99$69.99	$59.48$59.48	$109.98$109.98
Type	Phono Preamp with Vacumm Tubes	Phono Preamp with Vacumm Tubes	Phono Preamp	Headphone Amp + Preamp	Preamp	Preamp + Headphone Amp
MAX Power Output	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.	Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.
Input	RCA+3.5mm AUX	RCA+3.5mm AUX	RCA	AUX + RCA	RCA	Bluetooth + RCA
Output	RCA+3.5mm AUX	Active Speakers	Active Speakers + Headphone	3.5 mm + 6.35 mm	RCA	RCA + 3.5mm Headphone + AUX
Treble & Bass Control	✓	x	x	x	✓	✓
THD	≤0.1%	≤0.1%	≤ 0.08%	≤ 0.03%	≤ 0.1%	≤ 0.02%
SNR	≥70dB	≥ 98dB	≥ 70dB	≥ 95dB	≥ 98dB	≥ 103dB
Power Adapter	12V/1A	12V/1A	12V/1A	12V/1.5A	12V/1A	12V/1.5A
Work Voltage	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V

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Customer Reviews	4.5 out of 5 stars 8,327	4.4 out of 5 stars 2,366	4.5 out of 5 stars 3,274	4.5 out of 5 stars 748	4.4 out of 5 stars 558	—
Price	$78.99$78.99	$109.98$109.98	$59.99$59.99	$99.98$99.98	$99.98$99.98	—
Type	Bluetooth 2.0 CH Amp	Bluetooth 2.1 CH Amp	Bluetooth 2.0 CH Amp	Bluetooth 2.1 CH Amp	Bluetooth 2.1 CH Amp with Remote Control	Bluetooth DAC 2.1 CH Amp with Remote Control
MAX Power Output	100W x 2	50W x 2+100W	50W x 2	160W x 2	100W x 2	50W x 2
Input	Bluetooth + RCA	Bluetooth + RCA	Bluetooth + 3.5mm AUX	Bluetooth + RCA + U-disk	Bluetooth + 3.5mm AUX + U-disk	Bluetooth 5.0 + 3.5mm AUX + PC-USB + Optical + Coaxial
Output	Passive Speakers	Passive Speakers+Active/Passive Subwoofer	Passive Speakers	Passive Speakers + Active Subwoofer	Passive Speakers + Active Speakers/Amplifier/Active Subwoofer	Passive Speakers + Active Subwoofer
Treble & Bass Control	✓	✓	✓	✓	✓	✓
THD	≤ 0.04%	≤ 0.04%	≤ 0.04%	≤ 0.05%	≤ 0.001%	≤0.01%
SNR	≥ 98dB	≥ 98dB	≥ 98dB	≥ 98dB	≥ 92dB	≥105dB
Terminating Impedance	2-8 Ohm	2-8 Ohm	2-8 Ohm	2-8 Ohm	2-8 Ohm	2-8 Ohm
Power Adapter	24V/4.5A	24V/4.5A	19V/4.74A	24V/4.5A	24V/4.5A	24V/4.5A
Work Voltage	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V