OK well my story of delayed turn on of speakers is a bit different. My ex wife hated rock and music... she is now gone but my Kenwood KRA 5050 is still here. Problem is... I did NOT store it in a box or heavy plastic bag...compactor thickness... and the cats peed on it from the side. I know I know. I always thought of Kenwood as indestructable, like Yamaha. So... after exactly 20 minutes every day, the receiver sound turns on. I will try to find the delay circuit and use a little rubbing alcohol on the contacts. I did clean up the insides before plugging it in again for THE FIRST TIME in twelve (12) years.
My surprise is that after all that time asleep, and even with the extended delay... it still sounds perfect. And my calico of course christened the new addition to the living room in what was OUR house by biting through the cheezy FM antenna that comes with the unit. No matter its shorter two feet... it still works. Like I say... operates as brand new except for the extended turn on time. And I blame that on cat pee. And I will indeed open it up again and look for the circuit.
As it goes without saying, after long term unprotected storage of a stereo receiver, although in my defense it was on a shelf in the living room... not in a basement or attic... it is never a good idea to just suddenly some day plug it in and connect it up to speakers. I took off the covers and inspected the insides for damage of time. I vacuumed it out... lots of dust... and used isopropyl on the exposed contacts on the boards. The power side... high voltage... was not peed on, and looks in great shape. It never entered my mind when I got cats seven years ago that a simple heavy plastic trash bag or box would prevent dust and pee from animals from entering the guts of the receiver. Note to self.
Had a problem with a buzz on an older Sansui receiver I bought second hand from a computer tech. He said he could not fix it. I sent away to Sansui for about 5 bucks and they sent me the schematic diagram. Low and behold, the comp IT guy had soldered a sound wire directly into the transformer of the power supply... for what reason I have no idea. It too worked perfectly after undoing the botched repair attempt by a pro. That was back in the 80's. Back then Kenwood and Sansui made tanks. Great sounding hardware.