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I've had a Beltron like yours since the 1970s. I'm totally sold on it and learned how to "play it" like a fiddle over time. Tubes of different manufacture respond differently to different approaches with the Beltron. Tubes of Sylvania manufacture prefer a gentle cleaning, while RCA manufactured tubes like a balls to the wall restoration process best.
I was a Sony warranty station and the Beltron was referred to as "Lazarus" for its ability to raise the dead, in a Sony service bulletin.
Learning to quit while you're ahead is an important strategy in successful use of the Beltron.
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