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
HIFI A1 Headphone Amplifier AMP Machine Finished Dual 15-18V Reference Beyerdynamic A1 Headphone Audio Amplifier
Aliexpress UK
For sale: a genuine early 1960s Watkins Dominator Mk I valve amplifier.
eBay
AMXEKR 8W*2 A20B Tube Amplifier Power Bluetooth 5.0 Single-Ended Class A Audio Amplifier Home Theater Bluetooth Amplifier
Aliexpress UK
True Class A Tube Warmth: Enjoy the rich, smooth tone of a single-ended Class A vacuum tube amp. F2 brings lifelike detail and natural dynamics to your home setup—perfect for relaxed, immersive listening with bookshelf or floor-standing speakers. Tube Rolling Friendly Design: All tubes are pluggable, letting you fine-tune the sound. Default with 5U4G, 6SN7GT and 6CA7 tubes. Enjoy the freedom to personalize tone and texture based on your gear and musical taste. .
eBay
2 piece OPA2604AP/OPA2604AQ Dual Op Amp Second-hand Op Amp Operational Amplifier Replace OPA2604AQ LME49720NA AD827JN OPA2132PA
Aliexpress UK
Pure class A single-ended circuit design: inspired by many classic circuits, adopts 2PCS 6N2 triode for voltage amplification, 2PCS EL34 for single-ended amplification; and 5Z4PJ for rectification (315V+315V). The single-ended circuit output power can reach 12W+12W and has good control of the speakers. Enough power and HIFI tube sound: with 200W power transformers and 15W audio output transformers with no large loop feedback; the sound quality is pure and warm, full and mellow, sweet and natural; medium frequency is full and stable, high frequency is clear and delicate. Attractive appearance and high-quality technology: with volume control and input switch, easy to use; exquisite silver lacquered panel and vacuum tube with artistic and retro feelings, providing wonderful auditory and visua.
eBay
SMSL PH-1 amplifier High fidelity MM phono AMP Gold gain 46dB ultra-low distortion Integrated headphone amplifier function
Aliexpress UK
Nice transformer but unsure of output voltage. Untested
eBay
AK270 400W 12V Hifi Power Amplifier Stereo Home Car BASS Audio Amp Music Player Car Speaker Class D Car Home Sound Power Amp AUX
Aliexpress UK
I added an extra input and output. My first amp, up for grabs. The amp was dirty cream, but probably once white. I was very happy. However the thing was old then and looked very tatty and stank!
eBay
FUHAM KS2500 Power Amplifier 2/4 Channel 8 Ohm 1200W Audio Amplifier Digital Amplifier Audio DJ Stage Performance
Aliexpress UK
125watt 2x12. Essentially an AC30 on steroids. Obviously a 125 watt valve amp is loud as fck.
eBay
Audio Power Amplifier 300W bluetooth HiFi Amp Speaker 12V AV Amp Speaker Remote Control For Car Home Square Dancing 5.0 Channel
Aliexpress UK
Featuring 3 storable scenes with 2 channels (selectable from 6 separate classic amplifier models), the Amp Academy makes lugging a heavy valve amp around a pointless exercise! The sound and experience of a valve amp in compact pedal form.
eBay
2x200W Tube Amplifier 5.0 Bluetooth Amp Pre-stage Sound Amplifier OPT COAX MIC For Audio Home Theater 4/8Ω Speakers Subwoofers
Aliexpress UK