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Aguilar DB728 schematic

I am also searching for DB 728 schematic too...took out 2 bad caps yesterday.
12 Caps seating in so tight to chassis...heat builts up melted the capacitor and made contact sparks flying like fireworks. Got it replaced but still working on the constant hum...Anyone experienced with this hum? Don't think it's the tubes...more like ground hum. Since the capacitors incident may cause short somewhere.