Choosing 6N2 and EL84 tubes to amplify the low-frequency voltage and power amplification, and 6Z4 tube to rectify. Each tube has been tested by GS-5A tube tester and distortion test, with low power consumption and high efficiency. Using The classic two-stage negative feedback amplifier, with stable overall performance and low noise. It is suitable for classical and vocal music, and the output sound is pure, warm, delicate and mellow. High-quality components can ensure sound quality such as Japanese chemical electrolytic capacitor; ALPS potentiometer; Italian Arcotronic coupling capacitor; Taiwan Kunmao metal film resistor and FR4 epoxy glass fiber circuit board. With 1.4mm steel plate, aluminum alloy CNC panel and knob and high-quality gray paint. Very perfect in circuit design and workma.
eBay
Douk Audio HiFi Hybird Stereo Valve Tube Amplifier Bluetooth 5.0 Audio Receiver COAX / OPT Power Amp USB Player
Aliexpress UK
The kit allows users to easily assemble and customize their amplifier to achieve optimal sound quality for their audio needs. Ideal for audiophiles looking to enhance their sound system with a classic valve amplifier design.
eBay
Douk Audio HiFi Bluetooth 5.0 Valve Tube Preamp Stereo Receiver USB Player Home Desktop Pre-amplifier w/Treble Bass Control
Aliexpress UK
2: Signal amplifier tube adopts 6N2, power amplifier tube adopts EL84, low noise, stable performance, suitable for classical and vocal music. Rated output power: 4w+w. Left and right channel separation: >60dB.
eBay
Juson Audio JTA50 Hifi Tube Amplifier BT Combined with Paiyon HIFI 4S 4 ohms Passive Bookshelf Speakers
Aliexpress UK
Build your own ST-70 stereo amplifier with this complete DIY kit! DIY Hi-Fi push-pull stereo amplifier kit. 1x IEC power inlet with RFI filter, switch, and fuse. Note: Tubes, capacitors, resistors, and wiring are not included.
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Douk Audio P1PLUS Bluetooth Tube Preamp USB DAC Headphone Amp with VU Meter support DSD256
Aliexpress UK
Choosing 6N2 and EL84 tubes to amplify the low-frequency voltage and power amplification, and 6Z4 tube to rectify. Each tube has been tested by GS-5A tube tester and distortion test, with low power consumption and high efficiency. Using The classic two-stage negative feedback amplifier, with stable overall performance and low noise. It is suitable for classical and vocal music, and the output sound is pure, warm, delicate and mellow. High-quality components can ensure sound quality such as Japanese chemical electrolytic capacitor; ALPS potentiometer; Italian Arcotronic coupling capacitor; Taiwan Kunmao metal film resistor and FR4 epoxy glass fiber circuit board. With 1.4mm steel plate, aluminum alloy CNC panel and knob and high-quality gray paint. Very perfect in circuit design and workma.
eBay
Audiophile High-power Tube Power Amplifier Wireless Bluetooth HIFI Mini Tube Power Amplifier Amp Optical Fiber Coaxial Interface
Aliexpress UK
2: 6J1 school sound, soft and sweet sound. Features: 6J1 school sound, soft and sweet sound. 1 Power amplifier finished kit. 4: Overheating DC short circuit protection. Channel: 2 channel stereo. Protection feature: overheating DC short circuit protection.
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Audio Set Smart Home Theater TUYA Wall Sound Amplifier WiFi Touch Screen Android Power Amp Bluetooth 6"" Stereo Ceiling Speaker
Aliexpress UK
MOFI-EAR834-Phono Amp(MM), It is based on the core circuit of the EAR834 phono amplifier. Compared with the commonly reproduction of EAR834, we improved Clean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts.
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Douk Audio 5654 Valve Tube Phono Stage Preamp Stereo Audio Preamp for TV/MP3/Phone Headphone Amp w/VU Meter
Aliexpress UK
Tube model：6V6+6SL7. Tube model：6V6+12AX7. Tubes model：EL84+12AX7. Rectifier tube:5Y3 / 5R4 / 5U4 /5AR4 /5Z3. Power tube can use 6V6/6P6P/EL84/6P14. Signal tube can use 6SL7 / 6N9P / 12AX7. Main PCB board size: 120x270mm.
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Fosi Audio P2 integrated Portable Headphone Amplifier Vacuum Tube Amp Mini HiFi Stereo Audio with Low Ground Noise for Headphone
Aliexpress UK