Block vb pcb mount dual output transformers 23va block vb 2 329 the block vb pcb mount transformer 23va 2 x 9v 2 x 255ma has been designed for high ambient temperatures and is unconditionally short circuit proof this high quality transformer is also equipped with double output voltage for series or parallel connection while boasting permanent corrosion protection high insulation value and maximum electrical reliability thanks to xtradensifill resin encapsulation vb double voltagecon