VX S40 mkII - power amplifier

An amplification set with unequalled and unrepeatable features, as the result of the most advanced and mania-cal research by the Vexo team in audio equipments. Two separate units of absolute level, with a fully dual-mono and balanced design. The best of modern tube technology supported by a far out of the ordinary power supply. These pieces of equipment express an extreme, no-compromise vocation and reach a truly amazing level of smoothness, transparency, detail and overall quality. A combination of strength and gentleness that has no precedent in the use of the most beloved directly heated triode of all time, i.e. the legendary 300B tube: 50 +50 Watts into 4/8 ohms for an extraordinary experience of pure musicality and pleasure. A "real sound machine" which highlights and summarizes the philosophy adopted by Vexo:


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Model S40 mkII Power amplifier       300B Parallel Push-Pull

- Parallel push-pull design with zero negative feedback.

- Fully balanced tube circuits (no discrete components or integrated circuits).

- Double chassis (power amplifier and separate power supply).

- Totally dual mono configuration with 4 encapsulated and resinated toroidal power

   transformers (separate anode voltage and filaments voltages for each channel),

   mounted on a double support that is de-coupled with anti-vibration devices.

- Fifth transformer exclusively dedicated to auxiliary and control functions.

- 12 independent stabilized power supplies dedicated to filaments voltage.

- Power tubes protection via proprietary "Bias Guard" system operating on two levels.

- "Digital Bias Control" system for the calibration and control of the power tubes bias.

- 10 Years Warranty (excluding tubes).


Technical Details

• Tube complement : 

• Output power : 

• Total Harmonic Distorsion THD (1 W) : 

• Bandwidth (1 W) : 

• Negative feedback NFB : 

 Signal to noise ratio (S/N) : 

• Input sensitivity :

• Input impedance : 

• Output impedance : 

• Inputs :

• Power supply : 

• Dimensions (H/W/D) : 

• Net weight :

300B x 8, 6SN7 x 4, 12BH7 x 2

50 W + 50 W RMS - 1KHz

< 0,15%

8 Hz ÷ 60 KHz , +/- 1,5 dB

0 dB

> 100 dB

1 V RMS - 1 KHz (50 W RMS)

100 KΩ (RCA), 200 KΩ (XLR)

4/8 Ω

1 x RCA, 1 x XLR

120 V/230 V - 60/50 Hz

470 x 275 x 600 mm + 470 x 275 x 600 mm

40 Kg + 60 Kg approx.

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