Magnavox PP EL84 Amp question

Sure, why not? Just be careful screws don't get in the way of electronics.
Listen to the same track before and after and see if you spot a difference in sound quality. I had one of these units once and it served me well in rented digs. If the tubes are old, especially the EL84s, you could try a fresh set of tubes from here: https://www.tubedepot.com/t/tubes/power-tubes/el84-6bq5-7189

Your PP EL84 (6BQ5) will do about 12 - 15 wpc. And will have a bass response dropping off at 50hz (small output trannies). It will work well with a high-sensitivity speaker like a Klipsch Heresy. Also will match well with a speaker having a powered woofer (Golden Eagle Triton).

Thanks for all your replies.

Why screw them in?  I use isoblocks all the time.  They never move.  Enjoy the amp-amazing, smooth sound that will last decades more.