Photos of inside of the PreHE XJ-S power amplifier. This amplifier receives pulses form the ECU and sends pulses to the 12 fuel injectors. It is sturdily built and appers to be in good shape after 30 yers of service. It was working when I replaced it with another used one while chasing problems. I'm thinking about replacing the capacitors, transistors, and resistors just because it doesn't look difficult.