whats the dif between the fisher 404 and 504 quads??

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I just got a fisher 404 quad recever and cant find any on the net or ebay . i have seen two 504s and one 304(?) were they rare or just a fad?. all eight speaker outputs work i havent cheked any of the component inputs yet. every ting lights up all the indicaters wok it just needed 30+years of ciggarett somke cleaned off it. any info on this beast wold be very helpfull thankand TURN IT UP!!!!!!!!!
:D
 
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