First If your going to use it, why not ?
I would skip restoring the CD player, CD is on the way out.. or out na ata
unless you have a lot of CD and dont have a player, then again CD/ DVD player is cheap.
I would personally restore the amp. Get a tech to clean the switches and knobs ("may" require capacitor replacement in some areas, if you get a popping sound when you start clicking on the buttons and using the switches)
Tuner rarely needs restoration
Equalizer, would require cleaning of the sliders.
Turntable, depends do you want to go analog
Here is another thread with a lot of vintage gears
http://www.pinoydvd.com/index.php/topic,92560.0.htmlThe