Auris Adagio 300B Integrated Amplifier

2 x 8 W class-A 300B SET with automatic bias, XLR and RCA inputs, and Bluetooth

The Auris Adagio 300B is a compact, reference-grade integrated amplifier built around the legendary 300B triode. Its hand-wound double C-core output transformers and zero global feedback topology prioritize purity of tone and microdynamic nuance. An OLED display with real-time VU metering provides clear status at a glance without distracting from the listening.

Adagio is built around the legendary 300B single-ended triode, know for its saturated midrange, coherent imaging, and effortless flow. Automatic bias is factory-set to 75 mA to keep the tubes in their optimal operating window, preserving linearity and extending tube life while avoiding the drift and guesswork of manual adjustment.

System integration is straightforward. The rear panel offers one balanced XLR and three unbalanced RCA inputs plus Bluetooth for casual listening. 4 Ω and 8 Ω speaker taps ease speaker matching. Don't be afraid to try both with your speakers, no matter what their nominal impedance rating, to hear what sounds best. 

Specifications

Topology

Type: Integrated tube amplifier, single-ended triode (SET)

Circuit Topology: Pure class-A, zero global feedback

Output Transformers: Hand-wound double C-core

Bias: Automatic, 75 mA

Tubes

Output Tubes: 2 x 300B

Driver Tubes: 2 x CV-181 / 6SN7

Performance

Power Output: 2 x 8 W

Frequency Response: 7 Hz–32 kHz

Input Impedance: 47 kΩ

Inputs & Outputs

Inputs: 1 x XLR (balanced), 3 x RCA (unbalanced), Bluetooth

Speaker Outputs: 4 Ω and 8 Ω taps

Display: OLED with VU meter