The Fosi Audio GR70 is a premium quad-tube headphone amplifier and preamp that blends the classic charm of vacuum tube audio with the precision of modern engineering. Featuring two 5654W and two 6Ж4 replaceable vacuum tubes, it delivers a rich, warm, and immersive listening experience that brings music to life.
Its dual-stage amplification ensures exceptional clarity and tonal depth—5654W tubes boost voltage for smooth mids and highs, while 6Ж4 tubes handle power amplification for dynamic, textured bass. Whether you’re pairing with over-ear headphones, IEMs, or a full Hi-Fi system, the GR70 adapts effortlessly.
With low and high impedance modes (16Ω–300Ω), multiple headphone outputs (6.35mm & 3.5mm), and RCA input/output for preamp functionality, the GR70 fits seamlessly into any audio setup. The large top-mounted volume knob, bass & treble tone controls, and dual-side ventilation make it both functional and stylish.
Built from CNC-machined aluminum alloy, this compact yet powerful amp outputs up to 300mW @ 32Ω, offering a signal-to-noise ratio ≥97dB for clean, distortion-free sound. The Fosi Audio GR70 is the perfect choice for audiophiles seeking authentic tube warmth without compromising detail or precision.
Specifications
Model: Fosi Audio GR70 Type: Tube Headphone Amplifier & Preamp Tubes: 2 × 5654W, 2 × 6Ж4 (replaceable) Input: RCA Outputs: RCA, 6.35mm, 3.5mm headphone jacks Max Power Output: 300mW @ 32Ω Power Input: DC 12V/3A Headphone Impedance: • Low Mode: 16Ω–120Ω • High Mode: 120Ω–300Ω Output Voltage (RCA): 1.2V SNR: ≥97dB Controls: Volume knob, bass & treble tone controls, high/low impedance switch Body Material: CNC-machined aluminum alloy Design Features: Dual-stage amplification, dual-side ventilation, compact form factor
Model: Fosi Audio GR70
Type: Tube Headphone Amplifier & Preamp
Tubes: 2 × 5654W, 2 × 6Ж4 (replaceable)
Input: RCA
Outputs: RCA, 6.35mm, 3.5mm headphone jacks
Max Power Output: 300mW @ 32Ω
Power Input: DC 12V/3A
Headphone Impedance:
• Low Mode: 16Ω–120Ω
• High Mode: 120Ω–300Ω
Output Voltage (RCA): 1.2V
SNR: ≥97dB
Controls: Volume knob, bass & treble tone controls, high/low impedance switch
Body Material: CNC-machined aluminum alloy
Design Features: Dual-stage amplification, dual-side ventilation, compact form factor
In The Box
GR70 Main Unit *1
6AC7 Vacuum Tubes *2
5654 Vacuum Tubes *2
Tube Protection Covers *2
12V/3A Power Supply *1
User Manual
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form
Cable: 1-month warranty only for manufacturing defects only
Fosi Audio is a dynamic brand dedicated to providing the most comprehensive range of Hi-Fi audio products in the market. We cater to passionate audiophiles by offering Hi-Fi products, DIY kits, and expert guidance, ensuring an immersive audio experience. Beyond a mere transaction, we foster enduring relationships with our clients, supporting them throughout their audio journey.
Our diverse product lineup includes the Hi-Fi power amplifier, pre-amplifier, headphone amplifier, DAC, music player, Bluetooth receiver, DIY board, DIY chassis, and an array of DIY kits. These meticulously crafted offerings embody our commitment to exceptional sound quality and innovation.
Established in China in 2017, Fosi Audio was founded by a team of devoted audiophiles. Our products have gained significant popularity within the Chinese DIY audio community, amassing a large and dedicated following. To expand our reach beyond borders, we launched this website in 2017 and began offering a selection of products on Amazon under the name "Fosi audio." However, please note that many of our outstanding products are not yet available on this website or Amazon. If you cannot find what you're looking for, simply reach out to us via email, and we will be delighted to assist you in finding the perfect product to meet your needs.
At Fosi Audio, we are not just a brand; we are your partner in achieving audio excellence. Join us on this immersive sonic journey and experience the true essence of Hi-Fi audio.
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I was exactly looking for this. It's very convenient to have Y shaped type C cable. I can sleep wearing this earphones. Sound quality is good after applying equalizer from online. I feel it will open up after using it for few hours. Mic quality seems to be also good. Its affordable and seems to be complete package. I hope moondrop considers to keep releasing next versions of marigold. It's really convenient to wear it as we don't have to fear it dropping from ears. We can just keep it on our shoulders when not hearing.
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Very good size and best quality
Most bast DACK on this prise range an existing case and type -c to USB converter otg buty full luck and wark quality thank you 🌹
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Best one for starters
Best one for starters...
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Tanchjim Bunny are good IEMs.
It is my first IEM and its really good. The clarity, the details and the separations are noticeable( if I compare it to my previous tws with the same cost).
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Siba Prasad Maharana
Very good product Very sutle and balanced audio
Very good product.
Very subtle and balanced audio output.
Thanks.
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Excellent DAC
Received product in excellent packaging. Satisfactory performance using with mobile and laptop. No significant heating. There is no noise which is the reason I had changed to this DAC from the earlier one.
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03/24/2026
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Good dac
Good dac, i had previously one 3.5 to c tye converter it was basic with no chip .this dac really draw out the juice from your phones to shake drivers . Nd if u guys have impedance issue you can use equilizer nd see the magic . This dac works well. Nd yes dac is essential to draw out the required Current/power.
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👌✌️
V8....Sound...👌✌️👍
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Excellent quality and a much needed accessory for iems
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Good Daily Drivers
Review after using it for a few weeks.
The sound quality is really impressive. It is not the absolute best, but one of the best in this budget segment.
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These might not be the best-sounding, most technical TWS in that budget, but they are good for my use cases.
ANC is good, though it might be improved. Mic quality is good enough, but it sometimes feels a little muffled.
Personally, the diagonal earpieces and oval rubber ear tips fit perfectly. They are comfortable for a long time. Battery life is good for me but not comparable with others; It would be good if there were a feature in the app to see the battery percentage of the case.
Custom and online DSP features are good. However, LDAC can't be used simultaneously with custom DSP and multipoint connections; this should be changed in the next firmware update. Also, sometimes the app feels glitchy and slow.
There is no IP rating mentioned, and the open-lid design is negative.
I might be forgetting something.
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My first time buying experience with TheAudioStore is very good
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K
Provide excellent protection
The protective case is made of good quality material and protects the TWS perfectly. The fit is good, but sometimes when taking the buds out, the charging case shifts slightly upward. I put a small piece of paper inside, and now it is perfect.
The texture and colour of leather is good, but it looked washed out because of my phone's camera.
I don't know if it is great value for money, but it provides good protection.
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👍
👍
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