Hello, I am new here. I recently bought a second hand Marantz 2226BL receiver dated 1978. I would like to change its electrolytic capacitors. I checked the components list in the service manual and some of the electrolytic capacitors are marked like: 10uF ± 30 35V or 10uF +100 -10 35V. Can you tell me what those ± values mean? I have checked some online electronics shops and they don't have the ± values in their components list. Also, what brands of capacitors do you recommend? Are there any other components that I should change, besides electrolytic capacitors? What temperature should I set the solder iron to change the capacitors? I am new to electronics DIY so any other tips would be very welcome. Thank you.