Synthesis Roma R510 AC Signature
Valve integrated amplifier in push-pull pentode configuration, fitted with an MC/MM phono stage and an XLR input, for demanding valve sound enthusiasts.
Description
The Roma R510 AC Signature is a valve integrated amplifier from Synthesis, built around a push-pull pentode power stage. This Signature version stands out with the addition of a balanced XLR input and an integrated phono stage compatible with MM and MC cartridges, allowing a turntable to be connected directly without a separate phono preamplifier.
The power stage relies on two matched KT88 valves per channel, paired at the input with an ECC83 (12AX7) double triode and a 12BH7 valve acting as phase splitter. This architecture delivers 80 W RMS into 6 ohm in Class A, with a frequency response of 20 Hz to 20 kHz (+-0.5 dB) and a signal-to-noise ratio above 90 dB A-weighted, figures that reflect stable reproduction across the entire audible spectrum and contained background noise for a valve amplifier.
The 50 kohm input impedance and the 400 mV sensitivity for 80 W make it easy to pair with most line sources on the market. The MM/MC phono stage uses a low-noise operational amplifier with a separate regulated power supply, while an oversized, shielded toroidal power transformer limits interference. A buffer OPA on the output stage also provides a low output impedance, fixed at 6 ohm.
This type of amplifier is aimed at listeners seeking the texture and dynamic rendering typical of valve stages, in a system where the turntable plays a central role thanks to the integrated phono stage. The compact format, at 410 x 210 x 420 mm for 25 kg, remains compatible with a standard hi-fi cabinet, while requiring proper ventilation around the unit due to the heat generated by the valves.
Technical specifications
| Power | 80 W RMS into 6 ohm in Class A |
| Signal to noise ratio | >90 dB (A-weighted) |
| Input impedance | 50 kohm |
| Input sensitivity | 400 mV / 80 W |
| Output impedance | 6 ohm |
| Frequency response | 20 Hz - 20 kHz (+-0.5 dB) |
| Power stage configuration | Push-pull pentode |
| Power stage (per channel) | 2 x matched KT88 |
| Input stage (per channel) | 1 x ECC83 / 12AX7 |
| Driver (per channel) | 1 x 12BH7 |
| Connectivity | 4 analogue line inputs (3 unbalanced RCA, 1 balanced XLR) |
| Dimensions (H x W x D) | 210 x 410 x 420 mm |
| Weight | 25 kg |
What to check before buying used
When buying used, it is worth checking the condition and matching of the KT88 valves, wear parts whose replacement directly affects the stated power and linearity. It is also useful to check the condition of the ECC83 triode and the 12BH7, as well as the proper operation of the MM/MC phono stage, particularly if the unit has seen little use with a turntable. Checking the capacitors and the toroidal transformer, which are sensitive to age and to the heat generated by Class A operation, helps ensure the overall reliability of the unit.
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