Component Car Stereo Stereo Main Amplifier GM-40. For sale is a vintage Pioneer. Component Car Stereo Stereo Main Amplifier GM-40 rated at 20W+20W. Pioneer had a product line they called Super system Component Car Stereos. The lineup was made up of a variety of components such as cassette/tuner combinations, cassette decks, equalizers, amplifiers, dual amplifier balancer, and speakers that enable you to achieve true high-fidelity music reproduction in your car. A la carte I guess you could say back then. Pioneers Component Car Stereo Stereo Main Amplifier GM-40 is rated at 20W+20W and comes complete with a universal amplifier mounting bracket. This system is in really good condition and the sound is true high-fidelity. I have personally gone through and tested the amplifier for trouble free operation. I soldered on a new in line fuse holder with new 4 amp fuse. Works great with vintage Pioneer Super system component car stereos. Check our other listings for more vintage Pioneer car accessories and Car stereos. Ask any questions you may have before purchasing. Check out my other listings! The item “Vintage Pioneer Component Car Stereo Stereo Main Amplifier GM-40 20W+20W” is in sale since Saturday, November 30, 2019. This item is in the category “Collectibles\Advertising\Merchandise & Memorabilia\Advertising-Print\1970-79″. The seller is “californiavet” and is located in Seaside, California. This item can be shipped worldwide.