Your receiver will never have a sub output. Too old. This leaves you two options: many receivers have little chrome jumpers connecting the preamp section to ...
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connect-preamp-to-vintage-receiver
Jul 15, 2012 — Yes you can connect a receiver to a pre-amp. Uses might be more inputs needed or amps to power more speakers.. Some older amplifiers and stereo systems also have preamps built-in (look for inputs marked ... Connect your turntable / preamp directly to an ACTIVE speaker. 939c2ea5af