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Zenith TVs with the 6BN6 or 6Z10 quadrature detector tubes were prone to buzz, especially when there is a lot of fine, bright detail in the picture. Careful adjustment of the sound IF, detector, and buzz controls will minimize, but not completely eliminate the problem. The best way I have found is to display a test pattern that causes buzz in the sound, then adjust everything in the sound section for least buzz. The RCA style sound detector using a dual control pentode was a bit more immune to this buzz problem.
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Erich Loepke
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