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Looking at that almost unreadable schematic I think the unregulated 24v is in deed for the unbalanced stuff only (btw this is what you want to connect to if your are after the "classic" dark & mushy dbx sound...)
If you are upgrading the internal psu it might be worthwhile to loose the 7x15 regulators and replacing them with 337/317 (and needed peripherals) for cleaner supply rails.
I did not measure transformer secondaries.
Stefan
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