• T20 Bluetooth Tube Amplifier Stereo Receiver 2 Channel Class D Digital Mini Hi-Fi Power Amp Preamp Compact Integrated Headphone Amplifier for Home Passive Speakers with 6J4 Vacuum tubes + Power Supply

    Specifications: Tubes: 6J4 x 2; Bluetooth version: Bluetooth 4.2 support apt-X and apt-X low latency; Headphones output: 16-64ohm; Amplifier Chip: TPA3116; Rated output power: 2*50W /4Ω; Audio input: RCA input + Bluetooth input; Audio output: 1 set of Banana Speaker Jacks; Signal to noise ratio: >99dB; Frequency: 20Hz-20KHz; Dimensions: 5.06*3.86*1.3in;  Power supply: DC 24V 4.5A;   Packing List: 1 * Power Amplifier 1 * Power supply  2 * 6J4 tube 1 * Bluetooth antenna

    • ASIN: B07Q26T5N7
    • ASIN: B07Q26T5N7
    • Brand: Fosi Audio
    • Manufacturer: Fosi Audio

  • Rockville BluTube 70W Tube Amplifier/Home Theater Stereo Receiver with Bluetooth

    Rockville BluTube Bluetooth tube 70 watt amplifier/home theater stereo receiverrockville BluTube audiophile grade tube amplifier with Bluetooth. 25 watts x 2 RMS @ 8 Ohm. 35 Watts x 2 RMS @ 4 Ohm. Tube Amps do not hard-clip even at high volumes and are extremely efficient. Due to this the amp sounds more like double the rated power!.

    • ASIN: B07L55V58S
    • UPC: 819216022603
    • ASIN: B07L55V58S
    • Brand: Rockville
    • Manufacturer: Rockville

  • Nobsound 6P1 6.8W 2 Vacuum Tube Power Amplifier; Stereo Class A Single-Ended Audio Amp Handcrafted (without Headphone Amp Function)

    Notice:Both 4Ω and 8Ω speakers can connect to the 8Ω and 0Ω posts of this amplifier. Specifications: Output power: 6.8W * 2 Frequency response: 20Hz-20KHz Input impedance: 100K ohms Output impedance: 4/8Ω SNR: 90db Input Sensitivity: 500mv-2000mv Harmonic distortion: 1% (1KHz) Tube: 5Z4P * 1 6H8C * 2 6P1 * 4 Operating voltage: 110V Weight: about 7 kg Size: 260mm * 215mm(including terminals and knobs 260mm) * 150mm (W*D*H) Package includes: Finished tube amplifier ×1 Power cable ×1

    • ASIN: B073ZXZ3Z5
    • ASIN: B073ZXZ3Z5
    • Brand: Nobsound
    • Manufacturer: Nobsound

  • RFTLYS - A2 - KT88 - Vacuum Tube Stereo Integrated Amplifier with Headphone Amp Output Bluetooth Input (Black)

    Warm reminder: You should take about 100h time to operate the amp.RUN-IN to the amp gives it's best and stable sound.so during the first 100h use time the sound maybe is not the best,you can also use your own run-in method. Specification: Frequency response: 15Hz-36KHz / (20Hz-30KHz) Harmonic Distortion: ≤ 1.2% (1KHz) Input Sensitivity: 290mV Output power: 35W * 2 (8Ω ) vacuum tube: KT88*4, 12AU7*2, 12AX7*1 Input Impedance: 100K Output Impedance: 4Ω 8Ω Headphone Output Impedance: 32Ω -300Ω Signal-to-noise ratio: 89dB Power supply voltage:110-120V 60Hz/50Hz(+-10%) (For United States)... [Read More]

    • ASIN: B07PM1N6ZZ
    • ASIN: B07PM1N6ZZ
    • Brand: RFTLYS
    • Manufacturer: RFTLYS

  • Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version

    Parameters: Tube: USA RAYTHEON JAN5899 ×2 Op amp: NE5532*2 (can be upgraded ) Lithium Battery: 12V, 1000mA Charging time: 2-2.5 hours Working time: 4-4.5 hours Output power: 450mW SNR: 105dB Suggest load impedance: 16-300Ω Output: 2.5 balanced Jack*1, 3.5mm Jack *1 Size (L*W*D): 115*69*23 mm / 4.5*2.7*0.9 in (without knobs) Packing List: 1× headphone amplifier 1× power supply 1× 3.5mm audio cable 2× band Notice: When using B4-X with your cellphone, if you heard some "zhi ~ zhi" noise in your headphone. Probably it is the inteference from your cellphone such like WIFI or 4G signal, whic... [Read More]

    • ASIN: B07KJ18H75
    • ASIN: B07KJ18H75
    • Brand: Little Bear
    • Manufacturer: Douk Audio

  • MUZISHARE X7 KT88 x4 Push-Pull Vacuum Tube Integrated Amp Power Amplifier MM Phono amp Remote Upgrade

    Warm reminder: You should take about 100h time to operate the amp.RUN-IN to the amp gives it's best and stable sound.so during the first 100h use time the sound maybe is not the best,you can also use your own run-in method. Specification: Rated output power: 25W + 25W (RMS Triode) 45W + 45W (RMS Ultralinear) Harmonic distortion: 1% (1kHz) Frequency response: 15Hz ~ 30kHz (-1.5dB) Input Sensitivity: 280mV; 520mV (pre in) Input impedance: 100KΩ Output impedance: 4Ω 8Ω Signal to noise ratio: 92dB Left and right output balance:

    • ASIN: B07MMMM6VX
    • ASIN: B07MMMM6VX
    • Brand: MUZISHARE
    • Manufacturer: MUZISHARE

  • YAQIN MC-13S EL34 (6CA7) 4 Vacuum Tube Integrated Push-Pull Amplifier (Silver)

    Color:MC-13S Specification Output Power:40W + 40W (8ohm) Frequency Response:10Hz -- 60kHz (±2dB) Signal/Noise Ratio: ≥85dB (A) Load impedance: 8ohm or 4ohm Distortion:≤0.9%(28W) Maximum Power Consumption:220W Sensitivity:≤0.26V Tubes: 6CA7T x 4 12AX7B x 2 12AU7 x 2

    • ASIN: B00A7IZN70
    • UPC: 636041211657
    • ASIN: B00A7IZN70
    • Brand: AIMPIRE
    • Manufacturer: AIMPIRE

  • Nobsound NS-08E Vacuum Tube Headphone Amplifier Hi-Fi Valve Headphone Amp Stereo Audio Preamplifier

    Notice: Please turn on the amplifier for about 15 seconds before you connect the audio source and put on the headset. We recommend using 24~600Ω headphones, while armature earphones and headphones that have low resistance and high sensitivity are not suitable. As there will be tube Microphone effect, please keep the amplifier steady while using it. For noise issue, please keep it away from devices like routers, mobile phones or something that may interfere in the audio signal. If there are no interference, please remove all input and listen to see if the noise still exists. If so, the device ... [Read More]

    • ASIN: B014FASL1A
    • UPC: 769700919653
    • ASIN: B014FASL1A
    • Brand: Nobsound
    • Manufacturer: Nobsound

  • Nobsound NS-10P Mini Vacuum Tube Preamp Audio Hi-Fi Stereo Pre-Amplifier Treble & Bass Control

    What's more: For the matching 3.5mm audio cables, please search them on Amazon with ASIN: B073RF3R2D or B073RF4NYS. Please note this is a preamplifier (not like NS-08E), which needs to be connected with amplifiers or active speakers. It is not a phono preamp and can't be used for turntables. It suits for almost all amplifiers in the market especially for tube headphone amps like our NS-08E (B014FASL1A), NS-01E (B01I19SBAW) and NS-02E (B01M7101CY), and will greatly enhance the sound performance of digital amplifiers like our TPA3116 amps (B00WTOAC1M / B074J9X3P5 / B01HD5T4QA / B07548PWQQ). Us... [Read More]

    • ASIN: B07719G56B
    • ASIN: B07719G56B
    • Brand: Douk Audio
    • Manufacturer: Nobsound

  • Nobsound 6N8P+6P3P HIFI Single-Ended Pure Class A Tube Amp Vacuum Power Amplifier DIY Kit

    Item specifics: Tubes: 5Z4P / 5U4C * 1 + 6N8P / 6H8C * 2 + 6P3P / 6L6GC * 2 Power supply: 300v * 2 6.3v 5v 3.15v * 2 Signal / Noise Ratio: 95dB Distortion: less than 1% at full power Frequency: 10HZ-70KHZ 3dB Output Power: 7W +7 W Voltage: 100V-240V Size: 290 * 170 * 150 mm Weight: 8KG

    • ASIN: B01MA2XASK
    • ASIN: B01MA2XASK
    • Brand: Nobsound
    • Manufacturer: Nobsound

  • Nobsound Little Bear P2 Mini 6C11 Vacuum Tube Headphone Amplifier Stereo Hi-Fi Audio Amp; Replaceable Tube and OP AMP; with LED VU Meter Music Audio Spectrum (Black)

    Replaceable Tube and OP AMP: Tube module: 6C11 (in default); EC81; 6R4 OP AMP: TI NE5532 (in default); OPA2111; OPA2604; OPA2132; OP275; OPA2107; JRC4558; MUSES02; LM4562 Spectrum Operation: Normal mode: 1. Press the button for 1 second - Mode switch (there will be a corresponding preview ). 2. Press the button for 3 seconds - Switch between real mode and AGC mode (there will be a corresponding preview ). 3. Press the button for 5 seconds - Enter the speed setting mode 4. Press the button for 10 seconds - Factory default 5. Double click on the button - Adjust the brightness of the light bar,... [Read More]

    • ASIN: B075T3SZS1
    • ASIN: B075T3SZS1
    • Brand: Nobsound
    • Manufacturer: Nobsound

  • LOXJIE P20 Full Balance Tube Amplifier Headphone Power Amplifier (Red)

    P20 is Loxjie's first full balance tube amplifier headphone power amplifier!It use the military grade 6N3 tube,Plus the well-designed and calibrated amplifier circuit! Let the amplifier have lower distortion under the premise of ensuring"Tube Style"!And the P20 also has true balanced inputs and outputs!This can maximize the performance of the headphones! Specification Output Power Unbalanced headphones 32Ω: 385mW 64Ω: 210mW 150Ω: 105mW 300Ω: 55mW 600Ω: 29mW Balanced headphones 32Ω: 425mW 64Ω: 665mW 150Ω: 565mW 300Ω: 325mW 600Ω: 175mW THD+N: 0.02% THD+N: 0.006% SNR: 97dB SNR: 102dB Po... [Read More]

    • ASIN: B07H5JLD2Q
    • ASIN: B07H5JLD2Q
    • Brand: LOXJIE
    • Manufacturer: LOXJIE

  • SMSL T2 Vacuum Tube Headphone Amplifier, Mini Audio HiFi Stereo Integrated Amp

    FEATURES: Our T2 amp utilizes two 6J9 J-grade tubes and two NJM5532D as core parts of the circuit. The 6J9 tubes amplify the voltage which increases the input signal. The current formed by NJM5532D (Made by JRC Japan Company) amplifies the electric circuit to drive the mini headphone amplifier. These two features provide an awesome combination of high quality sound and a very powerful drive current for an optimum listening experience! Our T2 amp adopts a Single Chip Microcomputer and Relay to control the muted sound when the device is OFF or first turned ON. It allows the device to warm up bef... [Read More]

    • ASIN: B06XYJB7S8
    • UPC: 607994576834
    • ASIN: B06XYJB7S8
    • Brand: SMSL
    • Manufacturer: SMSL

  • Nobsound Little Bear T11 6N2/12AX7 Vacuum&Valve Tube Phono Turntable Preamplifier; MM RIAA LP Vinyl Record Player Preamp; Stereo HiFi Audio Pre-Amplifier

    Technical Specifications: Output Voltage: 2.0V Gain = 48dB Input RIAA ≤ 5mV THD ≤ 0.5% Frequency Response: standard characters Signal to Noise Ratio ≥ 65dB(A)1KHz (input: 10mV; output: 0.7V) Power supply: AC110V(115V) 60Hz/50Hz Packages: 1 × Preamplifier 1 × 6Z4 Tube 3 × 6N2 Tubes 3 × Metal Tube Covers 4 × Acrylic Tube Covers 1 × Power Cable 1 × GND wire Q&A: Q: I got a loud hum with T11. A: At first, we have to clarify that all phono preamps have a certain of background noise. It won't be loud, while a little loud is normal. Besides, there are many factors. Reason A: T11 ... [Read More]

    • ASIN: B06XCM9NKV
    • ASIN: B06XCM9NKV
    • Brand: Nobsound
    • Manufacturer: Nobsound

  • Nobsound Bluetooth HiFi 6J2 Vacuum Tube Preamplifier Stereo PreAmp Digital Treble & Bass Tone Control (Black)

    Bluetooth Connection: Some customers may find the Bluetooth can't be connected or found. Here is the solution. 1. Power off the M8 and your phone. 2. Wait for 5s and then power on both. 3. If it still can't be discovered, repeat 1 and 2 and it should work. If the problem can't be solved, please visit https://www.amazon.com/sp?seller=ADPE7GPX91ORE and click "ask a question" to contact us. Troubleshooting: Please note that this product is a preamplifier. It is not an amplifier and needs to be connected with an amplifier or active audio devices. Also, it is not a phono preamp and can't work wit... [Read More]

    • ASIN: B078B7R8RJ
    • ASIN: B078B7R8RJ
    • Brand: Douk Audio
    • Manufacturer: Nobsound

  • DC12V Black Audio Mini 6J1 Valve & Vacuum Tube Pre Amplifier Stereo HiFi Buffer Preamp

    SpecificationsColor: BlackMaterial: AluminumSize: 95x100x32mm/3.7*4*1.3 inchPower: DC12V 1AFrequency Response: 20HZ (-0.2DB) ~ 20KHZ (-0.2DB)SNR: 100DBInput Sensitivity: 300 ~ 2000MVOutput: 3000MVTHD: 1000MV 0.1%FeaturesJ61 classic tube design, optimization lineTube design can be replacedAluminum alloy shell, durable classicDC12V Power

    • UPC: 519343914
    • Color: Black
    • Size: 95x100x32mm

  • The A B C of Vacuum Tubes in Radio Reception; an Elementary and Practical Book on the Theory and Operation of Vacuum Tubes as Detectors and Amplifiers

    The A B C of Vacuum Tubes in Radio Reception; an Elementary and Practical Book on the Theory and Operation of Vacuum Tubes as Detectors and

    • UPC: 679623801

  • 5654 6J1 Preamp Electron Vacuum Tube 7-pin for EF95 6AK5 5654 6J1 403A Audio Amplifier Tube Replacement

    Please note, this item ships from an international seller. Expected delivery is 10-15 days. International ShippingFeatures:5654 6J1 vacuum tube, 7-pin.Only for EF95, 6AK5, 5654, 6J1, 403A amplifier vacuum tube replacement.High reliability and stability.HiFi and soft

    • UPC: 840724433

  • 5654 6J1 Preamp Electron Vacuum Tube 7-pin for EF95 6AK5 5654 6J1 403A Audio Amplifier Tube Replacement

    Features:5654 6J1 vacuum tube, 7-pin.Only for EF95, 6AK5, 5654, 6J1, 403A amplifier vacuum tube replacement.High reliability and stability.HiFi and soft sound, low noise.Specifications:Model: 5654 6J1Heater Voltage: 6.3VHeater Current: 0.17AGrid Voltage: 120VGrid Current: 7.35mAGrid Electrode Voltage

    • UPC: 200881201
    • Size: 2Pcs

  • 5654 6J1 Preamp Electron Vacuum Tube 7-pin for EF95 6AK5 5654 6J1 403A Audio Amplifier Tube Replacement

    Features:5654 6J1 vacuum tube, 7-pin.Only for EF95, 6AK5, 5654, 6J1, 403A amplifier vacuum tube replacement.High reliability and stability.HiFi and soft sound, low noise.Specifications:Model: 5654 6J1Heater Voltage: 6.3VHeater Current: 0.17AGrid Voltage: 120VGrid Current: 7.35mAGrid Electrode Voltage

    • UPC: 271656151
    • Size: 2Pcs

  • 5654 6J1 Preamp Electron Vacuum Tube 7-pin for EF95 6AK5 5654 6J1 403A Audio Amplifier Tube Replacement

    Please note, this item ships from an international seller. Expected delivery is 10-15 days. International ShippingFeatures:5654 6J1 vacuum tube, 7-pin.Only for EF95, 6AK5, 5654, 6J1, 403A amplifier vacuum tube replacement.High reliability and stability.HiFi and soft

    • UPC: 592612525

  • 5670 6N3 Preamp Electron Vacuum Tube 9-pin for 6N3P 2c51 5670 396A Audio Amplifier Tube Replacement

    Please note, this item ships from an international seller. Expected delivery is 10-15 days. International ShippingFeatures:5670 6N3 vacuum tube, 9-pin.For 6N3P, 2c51, 5670, 396A amplifier vacuum tube replacement.High performance, soft sound, ultra-low noise.Perfectly work as

    • UPC: 614685201

  • 5654 6J1 Preamp Electron Vacuum Tube 7-pin for EF95 6AK5 5654 6J1 403A Audio Amplifier Tube Replacement

    Features:5654 6J1 vacuum tube, 7-pin.Only for EF95, 6AK5, 5654, 6J1, 403A amplifier vacuum tube replacement.High reliability and stability.HiFi and soft sound, low noise.Specifications:Model: 5654 6J1Heater Voltage: 6.3VHeater Current: 0.17AGrid Voltage: 120VGrid Current: 7.35mAGrid Electrode Voltage

    • UPC: 600359423
    • Size: 2

  • The A B C of Vacuum Tubes in Radio Reception; An Elementary and Practical Book on the Theory and Operation of Vacuum Tubes as Detectors and Amplifiers. Explains Non-Mathematically the Fundamental Principles Upon Which All Vacuum Tube Circuits Are...

    This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as

    • UPC: 169988048

  • 5670 6N3 Preamp Electron Vacuum Tube 9-pin for 6N3P 2c51 5670 396A Audio Amplifier Tube Replacement

    Features:5670 6N3 vacuum tube, 9-pin.For 6N3P, 2c51, 5670, 396A amplifier vacuum tube replacement.High performance, soft sound, ultra-low noise.Perfectly work as a head in gain amplifier.Specifications:Model: 5670 6N3Cathode Voltage: ±180VAnode Voltage: 330VAnode Dissipation Power: 1.2VGrid Electrode

    • UPC: 345442396
    • Size: 1

  • Shuguang KT100 HIFI Vacuum Tube For Amplifier Best Matched Pair NEW

    • UPC: 382914246855
    • Category: Vintage Tubes & Tube Sockets
    • Price: 77 USD

  • Mini Vacuum Tube Headphone Amplifier Class A Home Stereo Amp Best Audio Preamp

    • UPC: 263338109856
    • Category: Amplifiers & Preamps
    • Price: 49 USD

  • Best 6K4tubes Vacuum Tube Preamp Stereo Pre-Amplifier Bass Tone Control DC 12V

    • UPC: 283480025275
    • Category: Amplifiers & Preamps
    • Price: 29 USD

  • Shuguang 812A Audio Vacuum Tube For Amplifier Best Matched Pair NEW

    • UPC: 382914127223
    • Category: Vintage Tubes & Tube Sockets
    • Price: 70 USD

  • Shuguang 572B hi-end vacuum tube valve best matched pair for amplifier new

    • UPC: 382910769105
    • Category: Vintage Tubes & Tube Sockets
    • Price: 108 USD

  • Shuguang 6146B HiFi Audio Vacuum Tube Valve For Amplifier Best Matched Pair New

    • UPC: 382917210629
    • Category: Vintage Tubes & Tube Sockets
    • Price: 67 USD

  • Shuguang 211 hifi audio vacuum tube best matched pair for amplifier new

    • UPC: 382950859311
    • Category: Vintage Tubes & Tube Sockets
    • Price: 124 USD

  • The World's Best Vacuum Tube Pre-Amplifier Audio HiFi Preamp Hi-End DIY Kit

    • UPC: 272135538552
    • Category: Amplifier Parts & Components
    • Price: 95 USD

  • MOTOROLA SYLVANIA 6AK5 VACUUM TUBE 1958 BLACK PLT NOTHING SOUNDS BETTER NOS NIB

    • UPC: 323839454549
    • Category: Amplifiers
    • Price: 22 USD

  • WESTINGHOUSE 5654 6AK5 NOS NIB VACUUM TUBE 1953 D GTR BEST TONE EVER LITTLE DOT

    • UPC: 223569054363
    • Category: Amplifiers
    • Price: 20 USD

  • 10 Best Vacuum Tube Amplifiers 2019

    Stereo - Tube vs Solid state amplification. Why use tubes in a HIFI stereo system?

    Are vacuum tubes worth it?