Thanks. I think that, as a temporary solution, I will stack the amp on the bottom, then the tuner, with the CD player on top. The tuner won't be on when the CD player is in use, and there will be enough space between the latter and the amp to reasonably disperse the heat.
Don't know about vibration issues, but it should be safe enough until I find a more elegant solution.
Don't know about vibration issues, but it should be safe enough until I find a more elegant solution.