My Dad got these while on Wake Island in 1961 or 62. He has a Marantz Model 7 amplifier and a letter from Marantz dated April 26 1962 that told him he was too isolated from the rest of the world and they would send complete details as well as the materials necessary for conversion to Model 9. The C-50 has one woofer. I don't know how to hook up the Marantz either. I have them playing through a receiver right now set to radio. I have an extra turntable I can hook up to see how well they sound.
You apparently have a Marantz 8B tube amp. You will need a preamp to connect from your music source to the Marantz. The Marantz 7 was a preamp - not capable of driving a pair of speakers!
@eltabor, There were two versions of the JBL C-50 Olympus a powered version, and a non powered version, the powered version, had a built in amp, called the energizer.
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