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hummmmm... what chassis is in your set. From 1968 I would assume a CTC-31 or a CTC38. It's got to be something in the 12HG7 (vid output tube) Did you check it on a tube tester. You may have a bad tube (new doesn't always mean they're good) Also make sure ALL the correct tubes are in the set. 6GH8's were always known to be a short-lived tube and they almost always test bad.
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