We do not support, or provide parts, for transformer replacement. The reason being that when replacing a power transformer, you risk damaging other components in the chain, either through the stress of removal and reattachment, or simply by accident. Our kits are not designed with the idea of replacing the transformer, and as such, it is quite entrenched in the circuit. Furthermore, the PT-10 transformer has different mounting requirements, and will not fit on the old chassis.