Okay - I got the stand braced up and a vent stuck into the top so she can BREATHE!!!!
My muffin fan will get mounted tomorrow when I put everything back together. I'll probably use a couple magnets and set the fan on top of the 85's case so it's pointing straight down onto the heatsink. I'll use a dryer sheet as a filter / room air freshener.
Hi,Your Marantz is sure purty, ain't it! I once had the rare 2285B Black Face. That was a real stunner, and the actual Unit I once owned can be seen on Ben Blish's Vintage Marantz Site. It was I who donated the picture to Ben, as well as the pic of the matching 5025 Black Face Cassette Deck.
I gotta honestly say though, you gotta dump that Rack!
Even if you drilled enough holes to make it look like a piece of Swiss Cheese, that unit's giving off heat not only from the top, but will give off heat from its sides, and even the bottom. Plus you're running some of that heat right up into your Turntable.
The Pancake fan will do only so much, usually becomes nothing more than a dust concentrator and the other downside of having to resort to the Pancake Fan is background noise.
I have seen lately, that Wally World has started carrying some really nice attractive Racks in thier furniture Dept, the prices aren't too expensive, and some are closely similar in size to what you currently have, just in case space is an issue.
About running the two pair of speakers. yes, the Unit will work harder, get a bit hotter, but shouldn't be a problem.
A consideration to remember, is that you are in essence halving your power-wattage output to each speaker.
While this shouldn't create any problems at moderate volume levels, if you decide one day to really crank the living heck out of the reciever, you could drive the reciever into clipping, and this can be damaging to your speakers. Keep that in mind. Mark