FOSI AUDIO GR70 Tube Headphone Amplifier
€ 179,00 Incl. Vat
✅ 2 years standard warranty
✅ Free return within 14 days
✅ Orders before 17:00 → shipped today
🟢 On stock
1 in stock|Delivery time: Order before 17:00h, shipped today mo-fr
Fosi Audio GR70Tube Headphone Amplifier 5654W / 6AC7
The Fosi Audio GR70 is a headphone amplifier based on a combination of two 564AW and two 6AC7 tubes. As a result, it delivers a smooth, warm and authentic sound. Thanks to its Low / High gain control, it can drive headphones with impedances ranging from 16 ohms to 300 ohms. In fact, it delivers up to 300mW of power at 32 ohms on its 3.5mm jack and 6.35mm jack headphone outputs. There’s also a volume control, a tone control and an RCA output for use as a preamplifier. The GR70 is supplied with 12V 3A via DC jack.
Fosi Audio GR70: Tube amplification
Within the Fosi Audio, 5654W tubes increase voltage while 6AC7s take care of power amplification. This configuration delivers the smooth, warm rendering so appreciated by tube aficionados. The GR70 delivers up to 300mW of power on its headphone outputs. Furthermore, the LO-Z setting accommodates low-impedance headphones from 16Ω to 120Ω, while the HI-Z setting drives headphones from 120Ω to 300Ω.
Fosi Audio GR70: Preamplifier feature
Fosi Audio has equipped its GR70 with an RCA output, enabling it to be used as a preamplifier with active speakers or a power amplifier, for example. This makes it easy to integrate the GR70 into a more complete Hi-Fi system.
| Specifications | |
|---|---|
| Product type | Headphone amplifier |
| Tubes | 2x 5654W 2x 6AC7 |
| Inputs | 1x RCA line input |
| Outputs | 1x 3.5mm headphone output 1x 6.35mm headphone output 1x RCA output |
| Headphone output power | Up to 300mW @ 32 ohm |
| Headphone impedance | LO-Z mode: 16Ω-120Ω HI-Z mode: 120Ω-300Ω |
| Frequency response | 20Hz-20kHz (+/-1dB) |
| SNR | ≥ 97dB |
| Dynamic range | ≥ 97dB |
| THD+N | Headphone output: ≤0.5% RCA output: ≤0.26% |
| General | |
|---|---|
| Power supply | 12V 3A via jack DC |
| Dimensions | 1x 46 x 192 x 129mm |
| Weight | 900g |
| Package | 1x Fosi Audio GR70 2x 5654W tubes 2x 6A7C tubes 2x Tube protector 1x Mains adapter 12V 3A |
Shipping - Made easy with DPD, DHL and your National shipping company
We deliver your Hifimastery order as quickly as possible via DPD, DHL, or PostNL (your country’s national postal service). You choose your preferred carrier at checkout. All shipments are insured and tracked, so we handle any loss or damage.
Shipping Costs:
- Netherlands & Belgium: Free shipping on orders over €50;
- Other European countries: Free shipping on orders over €100–€200 (depending on country, always visible in checkout before payment).
The higher the order amount the lower the shipping costs until the free shipping amount is reached, which is fair...
Order Shipping Times:
- Orders placed before 17:00h and in stock ship the same day monday-friday;
- In case a product has a longer delivery time than this is mentioned at the stock status!!!
You choose we follow:
You can choose in the checkout what shipping company you want us to use for shipping your order. Sometimes due to longer delivery times etc, we can choose another reliable partner based on your order.
Track & Trace
We know you’re eager to enjoy your order—and we completely understand! Once your order has been shipped via an external carrier, you’ll receive an email from us containing a tracking number or a direct link to the carrier’s tracking page. This lets you see exactly when your order is expected to arrive.
If your order is delivered to a pickup point due to your absence, you’ll be notified either through the tracking information or via services provided by the carrier.
Returns & Right of withdrawal – We keep it simple
Not satisfied with your purchase? No worries! Returning items is simple and stress-free.
✨ Key Highlights:
- No reason needed – return “just because”
- 14-day reflection period – from delivery date and within 14 days later you can decide to keep it or not...
- Fast inspection – returns inspected within a few days most of time 5 days (max 14);
- refund will be done mostly same day after inspection is done.
Return Conditions:
Items are undamaged and clean.
- All accessories included (also manual etc);
- Original packaging;
- Pack items securely for safe return;
- Sealed products remain unopened (applies to fragile or hygiene-sensitive items, e.g., turntable styli, in-ear earbuds).
For furniture, always choose Option 2.
Option 1 – Return Label:
- Use our return portal to print a return DPD shippinglabel;
- Coverage is up to €500 via DPD (other carriers not insured);
- Returns are at the customer’s risk and expense (if you need more insurance value contact us so we can check for higher insurance or choose option 2)
Option 2 – Own Carrier:
- Arrange return with a carrier of your choice;
- Email us: “Return: order number …” to receive a return form to include in your package;
- Return requested more than 2 weeks after delivery day cannot be processed and declined.
Timeframe:
- You have 14 days to request a return calculated from the day the package was delivered to you;
- The package must be received in our warehouse within 2 weeks after your request to return the product.
Exchange product:
- Place a new order for the desired product;
- Original order must be returned and will be refunded (minus any return costs);
- Refunds processed via the original payment method within 2 weeks.



