AUDIO FUTURA spa
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.
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