Roma 510AC Signature

80W Integrated Stereo Tube Amplifier

It has taken few years of research and development for Synthesis to bring to market the new ROMA510AC Signature. The Signature version has on board the XLR input and MC/MM phono stage.

We introduced the toroidal transformers in amplifiers, which led to improved performance.To back this up the design has an over size shielded power transformer for reduce the interference. The MM and MC inputs stage use a low noise OPA with a separate regulated power supply with extensive filtering for reducing the interference and noise. Using an OPA as buffer on the output stage, gives this unit a very low output impedance without losing signal.

At first glance, this stunning amp simply takes your breath away! This high performance amplifiers brings out the best of other components in the system. Created by those obsessed with great sound and for those who love great music. The result is 80 watts of pure pentode output per channel built around a double triode 12AX7 on input and a 12BH7 tube as phase splitter and a pair of KT88 power tubes in push-pull configuration for a detailed, delicate and dynamic sound.


  • DC Powered tube heater
    All tubes, except KT88, have DC stabilised heater circuits to reduce hum noise to a near in-audible minimum.
  • Output transformer
    The Output transformer uses a Hi-Grade lron-Silicon for superb frequency reproduction & width. With this newly designed custom output transformer we are able to achieving a highly delicate & precise sound reproduction faithful to the original recording.
  • Power transformer
    Over size shielded power transformer for reduce the interference.
  • Mechanical chassis construction
    The power supply & output transformers are held by an extremely rigid structure that keeps the unit free from unwanted vibrations which further helps reduce unwanted noise to the tubes.
  • Remote control
    It has a soft button design, perfectly matching the aesthetics for the "ROMA" series. It controls volume, mute and sources selection.
  • Feet
    Four aluminium feet with an insert of strong rubber. These rubber feet has been chosen to minimise vibrations of the amplifier in isolation from its surroundings.
  • Binding posts
    Gold plated professional binding posts for a continued oxidisation free connection further improve sound refinement.
  • Sockets
    Gold plated ceramic sockets for a continued oxidisation free connection further improve sound refinement.
  • Components
    Components for the Roma 510AC Signature have been selected with great care throughout. Only the best available components are considered & all must undergo an exhaustive analysis of their sonic influence prior to final selection.
  • Selected tubes
    All tubes used are selected after 2 stage warm up. A fully computer monitored machine controls the process & at the end of this, selects the perfect tubes which are then matched for a perfect balance.


Power stage (1 ch.)

2 X KT88

Input stage (1 ch.)

1 X 12AX7/ECC83

Driver stage (1 ch.)

1 X 12BH7

Input impedance


Input sensitivity

400mV RMS

Output tap

6 Ohm


Push-Pull pentode

Power output
(1 ch., THD < 1%)

80W RMS @ 6Ohm

Frequency response

from 20Hz to 20KHz ± 0.5dB

Distortion (MAX Power)

1% @ 1KHz

S/N ratio

>80 dB (MM) “A” weighted
>70 dB (MC) “A” weighted

Cartridge Load (Selectable from rear panel)

MM type: 47KOhm - 47pF
MC type: 100/150/300/47KOhm


4 line inputs (n. 3 unbalanced RCA- n. 1 balanced XLR)
1 phono stage MC/MM

Gain Stage

Low noise OPA (MC-MM)


20Hz - 20KHz +- 1dB


40 dB


60 dB


Pre out (variable level)

Bias setting

Manual adjustment, independent for each power tube

Dimensions (w,d,h)




Line power

117, 230, 245 Vac, 50/60 Hz, (see rear label)


See rear label

Power consumption

300W Max

Remote control


Anodized black aluminium

Transmission type





Volume, mute, input selection, st-by


2 x CR2032