Rewiring Audio Note from 125v to 230volts

How does one convert the voltage? Does this means buying another transformer for the 230volts?
Thanks for guidance
It depends on if the unit was built with a dual voltage transformer. Are there four leads on the primary(voltage in) side of the power transformer? If there are: see if they are marked 1, 2 ,3, 4 or X1, X2, X3, X4. If so: disconnect the 2 and 3 leads from the lines, and tie them together. This will convert your primary to 230v(windings in series). If they are color-coded: you need a schematic or code chart to properly re-wire the x-former. If there are only two line voltage leads: You'll need a 230v x-former.
To change voltage on UK AN equipment is no problem because on every primar at AN trafo You have every power option. Go to AN pages and You can download manual for changing power on units. If You are skilled in soldering, You can do it Yourself. Enjoy!