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Classic gear from yesteryear; vintage audio standing the test of time.

RE: I found your IC but since you have the schematic.

Then the 19khz signal is still present.One time on a pioneer SX-850,I had a similar problem and it turned to be a bad spot in the stereo threshold adjustment.I ended up changing the pot with a Bournes PC trim pot.
See if you have a stereo threshold adjustment.I wish I had a better copy of your schematic and a breakdown of the IC..
Was your IC new you put in or was it a pull? They sell both on Ebay I see,

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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