Quote:
Originally Posted by bandersen
Does anyone know the significance of white tipped tubes?
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QA marks - proof that the tubes are installed after the tuner mounting assembly is installed in the cabinet. Much easier to shine a light and see two white (or yellow if Magnavox) tips than to reach in for a feel. Some Conn organs did the same with an orangish, almost fluorescent paint on the tips of some "voice" tubes and wire ties in the back recesses. The block on the QA final tag was also colored orange for their stamp.
(blessed to have had a PTS location about 1 mile from Dad's shop.....learned a ton from their youngest tech - I thought it was a PTS thing that many of their test RF amp and mixer tubes had painted tips, but they educated me on the QA thing.)