Grounding hum issue with mu tron phaser II

[orange418]

Hello guys, I haven't posted here in a while but I am finally back with my pedal queries because I have this resparked interest in squaring away unfinished pedal projects..I was wondering if anyone could send me a picture on how to ground my Mu tron phaser two with the three knobs..I seem to be having this ambient hum behind the phasing.. Any help is much appreciated. 

[Processaurus]

General hum could be any number of things, but my blind guess is the big electrolytic caps in the power supply may be bad, I fixed a mutron wah by replacing all of them, and touching up each solder joint.

Another thing it could be is if part of the chassis isn't connected to circuit ground.  Beep it with a multimeter to get the truth.