Gremlin Class A Tube Headphone Amplifier by Apos

Description

Product Overview

The Gremlin is a compact Class A tube headphone amplifier engineered by Apos to bring boutique‑level performance at an accessible price. Housed in a sturdy aluminum chassis measuring 6.38 x 6.06 x 5.28 inches and weighing just over 2 pounds, it packs 1250 mW of clean power. A fully balanced topology with XLR inputs and both 4‑pin XLR and 4.4 mm balanced outputs eliminates hum and interference, while a pair of matched CORE 12AU7 tubes from Ray Tubes provide the signature tube warmth. The hybrid design blends transistor precision with tube character, delivering a transparent yet musical soundstage.

Usage

Designed for audiophiles, musicians, and studio engineers, the Gremlin excels in critical listening environments. Whether you’re mastering tracks, enjoying high‑resolution streaming, or simply immersing yourself in a favorite album, the amp drives most high‑impedance headphones with ease. Its compact size fits comfortably on a desktop or near a mixing console, and the balanced connections make it perfect for long cable runs without signal degradation.

Why Choose Us

Apos stands behind rigorous quality control, sourcing matched tubes and using a fully balanced circuit to ensure low noise and high fidelity. The Gremlin’s hybrid architecture offers the best of both worlds: transistor stability and tube warmth. With a 4.8‑star rating from 35 verified customers and a best‑seller rank in headphone amps, the product has proven reliability and performance. Additionally, the amp supports easy tube swapping, allowing users to experiment with 12AU7 or 6922 tubes for personalized tonal shaping.

Key Features

• 1250 mW Class A output power for demanding headphones
• Fully balanced design with XLR inputs and 4‑pin XLR / 4.4 mm balanced outputs
• Matched CORE 12AU7 tubes delivering natural tube warmth
• Hybrid tube‑transistor circuit for precision and musicality
• Compact aluminum chassis, 6.38 x 6.06 x 5.28 inches, 2.09 lb

FAQ

Can I use other tube types?

Yes, the Gremlin accepts any 12AU7 or 6922 tubes, allowing you to experiment with different tonal characteristics.

What headphones can it drive?

The 1250 mW output comfortably powers high‑impedance, low‑sensitivity headphones as well as more efficient models, making it versatile for a wide range of users.

Is the amp suitable for studio monitoring?

Absolutely. The fully balanced circuitry minimizes noise and interference, providing a clean signal ideal for mixing and mastering.

How do I replace the tubes?

Simply unscrew the rear tube cover, remove the old tubes, insert new matched tubes, and allow a few minutes for warm‑up before use.

What warranty does Apos provide?

The Gremlin comes with a one‑year limited warranty covering manufacturing defects and includes access to Apos technical support.