So recently I was given an amazing old pioneer system consisting of a Pioneer receiver SX-6, tape deck CT-8R, reverberation amplifier SR-303, dynamic processor RG-2, and timer DT-510, and wanted to top it off with an equalizer. I was wondering what model would be appropriate with this setup. Which equalizer would have gone with this system in about 1980, and is it worth it to buy it? Any help is appreciated.