Likewise, I have an ICBM and lost the 15V 300 ma power supply. Where can I get a replacement? I stopped using the ICBM because there is a microphonic-like background hum, so I wonder is the source of the microphonic is from the power supply or is there a bad component (cap resistor etc) in the device? It sounds more like the microphonic background noise of tube gear. The hum is definitely not a ground loop.