SYNTHESIS ROMA 510AC

Pre owned. In excellent condition. Free from any evident signs of wear. Supplied with remote control, manual and original packaging.

The Roma 510AC is a valve integrated amplifier that interprets high-fidelity audio as a balance between aesthetics, build quality and sonic performance. Its appearance is designed to make a strong visual impression while reflecting the level of engineering behind the amplifier. The model is intended for listeners looking for an authentic and engaging sound, combining traditional valve technology with a carefully developed overall design.

The amplification section delivers 80 watts per channel in a pentode push-pull configuration, providing substantial power for a valve integrated amplifier and allowing it to drive a wide range of loudspeakers, including more demanding loads. The circuit is built around a 12AX7 dual triode in the input stage, combined with a 12BH7 serving as the phase splitter, while the output stage uses a pair of KT88 valves. This configuration is designed to provide a detailed, fluid and dynamic presentation.

The valve heaters are supplied with DC power for all valves except the output tubes, helping to reduce background noise to very low levels and improving the overall cleanliness and transparency of the reproduction. The custom-designed output transformer is manufactured using high-quality silicon steel and provides wide frequency extension, contributing to accurate and natural signal reproduction.

The chassis features a rigid mechanical construction designed to provide stable support for the power and output transformers while isolating them from external vibrations that could affect the signal. This attention to the mechanical structure contributes to the amplifier's low noise level and consistent tonal performance.

In listening, the Roma 510AC produces a three-dimensional and well-defined soundstage, a rich and textured midrange and authoritative dynamics, while retaining the harmonic warmth and musical character associated with valve amplification. Instruments are presented with a natural sense of space, resulting in an engaging and coherent reproduction.

Daily operation is facilitated by the remote control designed for the ROMA series, which provides control of volume, mute and source selection. The aluminium feet with rubber inserts are designed to limit the transmission of vibrations, while the professional gold-plated connectors and ceramic valve sockets provide stable and reliable connections and help prevent oxidation over time.

Hand-assembled in Italy, the Roma 510AC combines traditional craftsmanship with Synthesis engineering. Its design brings together substantial output power, valve-based amplification and a carefully developed mechanical and electrical construction, while retaining the tonal characteristics associated with this type of amplifier.

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
• Loudspeaker output: 4–8 Ω
• Configuration: pentode push-pull
• 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
• Signal-to-noise ratio: >90 dB, A-weighted
• Inputs: 5 line-level
• Outputs: variable-level pre-out
• Bias adjustment: manual, independent for each output valve
• Maximum power consumption: 300 W
• Remote control: black anodised aluminium body; infrared transmission; RC5 protocol; volume, mute, input selection and standby functions; 2 × CR2032 batteries; weight 200 g
• Dimensions (W × D × H): 410 × 420 × 210 mm
• Weight: 25 kg