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Well I don't like brighteners but does anyone know which brightener I would need for a 21yp4 tube. I didn't realize how many different ones there are. Would this tube be a 110 degree tube ? The chassis is parallel wired. Unless someone here has a brightener that would work for this tube that wants to sell it.
Last edited by timmy; 03-04-2020 at 06:36 PM.
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