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I have a Pioneer SX-850 Stereo from the 70's that just stopped working. When powered up all the lights, knobs, buttons, switches, etc. work, but no sound comes out. I also do not hear that distinctive "clic" sound after a few seconds when it is powered up. Thanks Will

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Hi and welcome to FixYa,

That distinct click is the relay activating. It is the built-in protection common to designs of this period. The only time the relay will not activate is when the protection circuitry has detected a fault in the amplifier/output stake. This would call for replacement of the defective components most likely a transistor complimentary pair or in some instances a large IC power pack.

Good luck and Thank you for using FixYa.

Posted on Dec 07, 2008

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