Using this Peavey XR - 600B Mixer Amp is straightforward. First, make sure to connect it to the correct power supply that comes with it. When you're setting up your audio, be aware that the pots might act a bit jumpy, so take your time to adjust them. Since the XLR input 3 is a bit quieter, you may need to increase the volume on it more than the others. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures. If you want to replace the missing EQ fader caps, you can look for compatible ones in the market. Just remember to handle it gently to keep it working well.