Re: TIP30 substitute for regulated -12V
The centre connection and tab on the 7812 must be taken to the -12V line. It is only taken to chassis when used in more conventional +12V form. Your photo seems to show the trace from that pin going nowhere!
I can't really see what that diode and output-side capacitor are doing, not much I suspect. Your choice as to leaving them in place. But I would probably remove them for now.
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