Can i Use this kind of psu?

[red]

It's for an amplifer.So what are the risks that may occur?
I know you will say it is an unsuall psu but I need to find out...

[Richard C]

Is this an attempt to obtain a split rail supply from a single secondary?

Ripple performance at least would be terrible since the capacitors are charged alternately, can't see any merit in this design at all

[Eva]

I've tried it from time to time with a 50VA or so EI core transformer to power a symmetric regulable power supply, until I got the rignt transformer

The result was normal as long as there were little o no imbalance between loads in the +Vout and -Vout

When loads tend to be different the transformer saturated due to asymetric voltage drop in its windings and asymetric Volts*Seconds applied to the core

Saturation will cause excessive transformer heating, excessive and asymmetric current consumption from mains and lots of voltage drop on the outputs

I've not tried it for powering an audio amp

You can try it but you will find its drawbacks soon

[red]

10q I am not going to try it because you were very persuasive...
It was the kind of answer I wanted.

[Tony]

Vout= 30 x 2.8 = 84 or +/-42 volts rails at no load...this should work although regualtion is inferior to that of a 60vct tranffo...