Audio Analogue SRL Verdi Cento manual Power Amps Power Supply, Vacuum Tube Preamplifier Stage

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Power Amps Power Supply

We have dedicated a secondary stage for each power stage channel to decrease the crosstalk and increase the “sound stage” definition. The power amps power supplies take advantage of the high power toroidal transformer and discrete high current rectifier bridge have been used to allow high current peaks. There are four 10000uF capacitors after the bridge for each channel (so 40000uF for each channel!) and a lot of capacity has been distributed close to the Power amps to provide the charge for fast audio

responses. The big capacitors and the discrete bridge we have used allow the power stages to perform very highly in bass reproduction. The particular solutions adopted in the power supplies allow the realisation of the high signal to noise ratio expected from the power stage circuit used.

2. Vacuum Tube Preamplifier Stage

The vacuum tube preamp section is the first active stage the audio signal meets in the unit and it is placed after the input selection circuit and the volume control. The Preamp not only has to amplify the signal and adapt the impedances but must also provide two out of phase signals to drive the bridge configured power stage. The unit is based on a “classic” and well-known scheme that we have developed to decrease the output impedance and match the application. Moreover, the fact that it produces zero feedback is its main outstanding characteristic. This means we haven’t modified the vacuum tube distortion characteristics in any way and we have let the vacuum tube play “as it is” (remember the “philosophy”…). Nevertheless, the overall distortion is kept low with a higher power stage gain that lets the preamp section work with a low level signal at all times.

Verdi Cento Integrated Amplifier 5 / 7