This Amp Supply LK-450/500/550/800 Replacement Power Supply Module Kit for the Amp Supply Company LK-series of amplifiers (LK-450, LK-500, LK-550 and LK-800) is a very easy kit to build and will provide decades of trouble free operation. It is designed around and features new modern 220uF, 450VDC, 105C High Temp, electrolytic capcitors, 1000 PIV 3A diodes, new 100K 3W bleeder resistors. The unit installs easily in the original location in the chassis. The unit also features an enlarged coutout area for easier fit around the transformer.This is a great chance to purchase an excellent kit with high quality components. The Amp Supply and Amp International Amplifiers are all getting older and it is only a matter of time before a capacitor fails and takes out the Transformer or other key components.