Resistance Soldering Unit Transformer Model FineScale StandardDesigned especially for hobby model resistance soldering. Use to make a DIY resistance soldering unit. You get a 90 va transformer with a dual (115+115) primary winding that can be powered from normal 120 or 230 volt household outlets. Dual secondary windings for high and low power operations. Wiring guide and instructions for making a DIY Resistance Soldering Iron are included. Transformer Specifications Transformer Rating 90 VA Chassis Mounted Yes