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FOSI AUDIO GR70 Tube Headphone Amplifier
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Fosi Audio GR70 Tube 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.
Fosi Audio GR70 overview
| 1 | 6AC7 tubes |
| 2 | 5654W tubes |
| 3 | Volume control |
| 4 | Impedance setting |
| 5 | 6.35mm headphone output |
| 6 | 3.5mm headphone output |
| 7 | Treble tone setting |
| 8 | Low tone setting |
| 9 | RCA input |
| 10 | RCA output |
| 11 | 12V 3A power supply via DC jack |
Technical characteristics
| 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 |
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