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1970's pioneer amplifier comes on, sound comes out of speakers for a minute then gradually gets quieter and fades out all together

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Without the specific make and model, it is difficult to rpovide specifics. But, your unit neds a general overhaul. There are probably numerous poor solder joints that need to be fixed as well as capacitors that should be replaced. Expect a repair bill in the $100 range.
Dan

Posted on May 21, 2008

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Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
Front Speakers 5 1/4" Doors Left Front (+) Green Left Front (-) Black/White Right Front (+) White/Red Right Front (-) Black/White Rear Speakers 6" x 9" Rear Deck Left Rear (+) Pink/Red Left Rear (-) Pink/Blue Right Rear (+) Pink/Light Blue Right Rear (-) Green/Red

The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.

Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?

Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.

As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.

The radios claim 50W per channel, but in reality give 12-15W RMS power.

A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.

This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.

Good Luck!!

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HI BBunk,

Sounds like the dead speaker took out the amplifier output too. You may need a new head unit.

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I Had That Happen To Me Its A Ground Problem. Check The Negtive Speaker Terminal And The Ground Wire Runing To The HeadUnit This Should Fix It.

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