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The Zenith converter box is ok on most brands of TV. Zenith TVs with the buzzomatic 6BN6 audio detector will buzz with any signal source they're not aligned to*.
Granted I mostly use my DTV converters AV jacks instead of RF to feed Blonder Tongues that then wirelessly transmit RF on any channel I want throughout my house.
*A few years ago I noticed an interesting thing with Zenith 6BN6 audio detectors...I had a video only vacuum tube RF modulator from the 50s, and a built an audio stage for it with a single tube 4.5 MHz FM osc/modulator that I could mix into the composite signal in the unit. That osc could be tuned for an offset not exactly 4.5MHz. I found on one of my buzzier Zenith's that if I tuned the RF carrier of that modulator I could completely null the buzz and get clean audio. This proves that IF alignment matters with the 6BN6.
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