SYNTHESIS ROMA 510AC

Pre owned. In excellent condition. No visible signs of wear. Comes with remote control, manual, and original packaging.

The Roma 510AC is a tube integrated amplifier that interprets high-fidelity as a perfect balance between aesthetics, build quality, and sonic performance, offering from the very first glance a presence that impresses and anticipates its capabilities. Designed for those seeking authentic and engaging sound, it is born from a passion for music as a total experience.

The amplification section delivers 80 watts per channel in a push-pull pentode configuration, a remarkable power for an integrated tube amplifier, designed to bring out the best in every component and confidently drive demanding speakers. The circuit is built around a 12AX7 dual triode at the input stage, paired with a 12BH7 functioning as a phase splitter, while the output stage uses a pair of KT88 tubes, capable of producing a detailed, smooth, and dynamic sound.

The DC-powered filament supply, used for all tubes except the power valves, reduces background hum to near inaudible levels, significantly improving clarity and transparency. The custom output transformer, made with high-quality iron-silicon, ensures wide frequency extension and faithful reproduction of the original signal with precision and naturalness.

The mechanical chassis is extremely rigid and designed to hold the power and output transformers securely, isolating them from external vibrations that could compromise the purity of the sound. This structural attention contributes decisively to the amplifier’s quiet operation and tonal coherence.

In listening, the Roma 510AC delivers a well-defined, three-dimensional soundstage, rich and substantial midrange, and authoritative dynamics, while maintaining the musicality and harmonic warmth typical of the best tube amplifiers. Each instrument occupies its own space naturally, providing deep and credible emotional engagement.

Daily operation is simple and refined thanks to the ROMA series remote control, which allows volume, mute, and source selection. The aluminum feet with rubber inserts minimize vibration transmission, while professional gold-plated connectors and ceramic sockets ensure stable, reliable, and oxidation-free connections over time.

Hand-assembled in Italy, the Roma 510AC represents the meeting of artisanal tradition and Synthesis technological innovation. In its class, it stands out for the exceptional balance of power, tonal refinement, and emotional engagement, able to compete with higher-end amplifiers without sacrificing the delicacy and musicality that define a top-level listening experience.

Technical specifications:

• Power stage (per channel): 2 × KT88
• Input stage (per channel): 1 × 12AX7/ECC83
• Driver stage (per channel): 1 × 12BH7
• Input impedance: 50 kΩ
• Input sensitivity: 400 mV RMS
• Speaker output: 4–8 Ω
• Configuration: push-pull pentode
• Output power (1 channel, THD <1%): 80 W RMS @ 6 Ω
• Frequency response: 20 Hz – 20 kHz ±0.5 dB
• Distortion (maximum power): 1% @ 1 kHz
• S/N ratio: >90 dB “A” weighted
• Inputs: 5 line
• Outputs: pre-out, variable level
• Bias adjustment: manual, independent for each power tube
• Maximum power consumption: 300 W
• Remote control: anodized black aluminum body; infrared transmission; RC5 protocol; volume, mute, input selection, standby; 2 × CR2032 batteries; weight 200 g
• Dimensions (W × D × H): 410 × 420 × 210 mm
• Weight: 25 kg