Vintage Synth Repair

Hey guys,

I figured you all have run into this problem before and I haven't yet.

I have an SH101 that I've been running off of batteries because when i plug in a power supply it creates a very loud hum. I went in and replaced the two caps that were nearest the power jack with no success. 

Any other ideas? I have the schematics now and I'm gonna take a closer look at this supply, but I'd appreciate any inpute.

Thanks,
Johnny