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Back in the day we replaced those 6GH8 blanker tubes in just about every Magnavox being serviced due to the brightness being slow to come up when first turned on. RCAs blanker circuit was almost identical to Magnavox, but RCA used a 6GU7 that had a much larger plate area, they held up better. Most of those Sylvania video amp tubes that called themselves "silver something?" never seemed to last, we sent a lot back in warranty, 6LM8, 6LF8 were the worst.
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