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An old time tech told me that starting in about the late 70's or early 80's most Quasars started having problems with oxidation with the connections on the boards which would create all kinds of problems including intermittant issues (ie set was moved and problem went away for a while). Board replacement was expensive and many sets were junked at that time. He hated working on them because you had to go through all the board connections before you knew if you had some other problem or not. He said some shops would not work on them at all after a while.
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