• Power for Demanding Headphones: Built around a discrete Class A output stage, Ampapa H1 delivers strong current drive and up to 4000mW from its balanced high-gain output, giving 16–600Ω headphones wider headroom, steadier control and smoother dynamics. 4.4mm, 4-pin XLR and 6.35mm outputs fit more full-size HiFi headphone setups.
• Preamp Control for Your Audio System: With 2×RCA and 1×TRS analog I/O, H1 keeps your DAC, CD player and streamer connected for simple source selection, while its preamp outputs can stay linked to multiple power amps or active speakers for system expansion. Designed to complement Ampapa Q1 and D1, it adds tube preamp control for a more unified stack.
• Custom ECC83 Tube Character: Made with exclusive PSVANE × Douk Audio ECC83 tubes, H1 brings a warmer, richer tube character to both headphone listening and preamp output. The custom tube set gives H1 a more distinctive out-of-box identity, while tube rolling support leaves room to fine-tune the sound later.
• Effortless Control Across Your Setup: Low, mid and high gain help H1 match sensitive headphones, everyday models and harder-to-drive pairs with less guesswork. HP, Line and HP+Line output modes cover headphone, preamp output or both, while the 1.5-inch OLED keeps key status clear and 12V Trigger helps compatible gear power on/off together.
• Built for Refined HiFi Use: Japan NJW1195 volume IC keeps channel balance stable, while pluggable op-amps leave room for sound tuning. 0.04% THD+N and ≥113dB SNR support clean signal performance, and the low-noise relays, isolated tube power shielding and CNC aluminum chassis add quieter operation and lasting build quality for demanding headphone listeners or serious HiFi users.

• Brand: Ampapa
• Model: H1
• Audio Inputs: 2 × RCA Inputs / 1 × TRS Input
• Audio Outputs:
       2 × RCA Outputs / 1 × TRS Output
       4-Pin XLR / 6.35mm / 4.4mm Headphone Outputs
• THD+N: 0.04%
• SNR: ≥113dB
• Frequency Response: 20Hz–20kHz (±0.7dB)
• Input Sensitivity: RCA: 1V ; TRS: 2V
• Rated Output Level (by Gain):
       RCA Output: High-3.0V ; Mid-2.1V ; Low-1.5V
       TRS Output: High-6.0V ; Mid-4.3V ; Low-3.0V
• Rated Headphone Output Power@32Ω (by Gain):
       Balanced Output: High-4W ; Mid-2W ; Low-1W
       Single-Ended Output: High-1000mW ; Mid-500mW ; Low-250mW
• Matched Headphone Impedance: 16–600Ω
• Power Input: DC 12V / ≥2A, 5.5 × 2.1mm
• Dimensions (W*D*H): 155 × 124 × 42mm / 6.10 × 4.88 × 1.65in
• Package Dimensions: 268 × 192 × 95mm / 10.55 × 7.56 × 3.74in
• Net Weight: 750g / 1.64lb
• Package Weight: 1.28kg / 2.82lb

User Manual of AMPAPA H1

FAQs

Q: Why won't H1 turn on with a short press after being off for a long time?
A: After H1 has been off for a long time, the tubes and capacitors may draw higher startup current as they power up and recharge. In this cold-start state, please press and hold the power button; once started, short presses work during normal use.

Q: Can I use multiple headphone outputs at the same time?
A: The 6.35mm output has priority. When a 6.35mm plug or adapter is inserted, the 4.4mm and 4-pin XLR outputs are disabled. For best performance, we recommend using one headphone output at a time.

Q: How should I choose the gain setting?
A: Use Low Gain for sensitive or low-impedance headphones, Mid Gain for most daily listening, and High Gain for high-impedance or harder-to-drive headphones. Start low, then increase the gain if more volume or drive is needed.

Q: Can I replace the tubes?
A: Yes. H1 uses ECC83 tubes and supports compatible tube rolling with 12AX7, 7205, 6N4 and 5751 tubes. Always power off the H1 before replacing tubes, and confirm compatibility before trying other tube models.

Q: Can I replace the op-amps?
A: Yes. H1 uses two pluggable LME49720 op-amps and supports replacement with standard DIP-8 dual op-amps such as OPA2604, OPA2134 and MUSES02. Please power off the H1 before replacement and check chip orientation carefully.

Q: What power adapter should I use?
A: Please use the included DC 12V/2A power adapter. If using another adapter, choose a high-quality DC 12V adapter rated at 2A or higher. Do not use an adapter with excessive voltage.