Audio Analogue Verdi Cento Owner's Manual - page 4
AUDIO FUTURA
AUDIO FUTURA
AUDIO FUTURA
AUDIO FUTURA
spa
Verdi Cento Integrated Amplifier
4 / 7
1.
Power Supply
The Power supply is the basis of every audio device. The Verdi Cento Integrated amplifier has
a very generous toroidal transformer with a dedicated secondary stage for each section of the
unit. After each secondary stage there are regulation circuits for every section, let’s see it in
some detail:
Input Selection/Volume control/PrePhono/RECOUT Powers Supply
A dedicated secondary stage and 4 voltage
regulator provide the supply for the input
selection section, volume control section, Rec
Out output stage and Pre phono section. The
pre Phono power supply is obtained by further
filtering of the regulator output voltage via a
low time constant RC square.
Vacuum Tube Preamp Power supply
A lot of care has been taken over the Vacuum
tube Preamp
power supply, because a Vacuum Tube differential pair (that is
the structure we have used in the preamp section) will never be
well matched enough to completely reject the power supply
variations. So we have designed a discrete component voltage
regulator to obtain a very stable voltage from the dedicated
high voltage secondary. The voltage regulator output is further
filtered by two very low time constant RC squares, one for each
channel. In such a way we have completely eliminated the
100Hz noise component and using separated RC square for the
channels also decreases the crosstalk and increases the “sound
stage” definition.
Vacuum Tube Heater
We decided to use a dedicated secondary for the
Vacuum tube heater, in this way it is possible to use
a linear voltage regulator for the purpose avoiding
potentially noisy switching type regulators. The
heather voltage has been selected to have the best
audio performance from the vacuum tube used.