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Having worked as a service call tech back in the 1960's, we sold a lot of brighteners. Usually they made a difference it the customer's set. Other times, they were a bit like selling $5.00 a foot "High Definition" speaker cables. The purchaser thought it looked better, even if there was no big difference. For the TV shop,it was an extra $5.00 on a service call and a usually happy customer, especially if you tweaked the ion trap while adding the brightener.
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