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What is different between the old versions of the Channel Master series of Pre-Amps and the newer redesigned version of their Pre-Amp products than raises eyebrows ?
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The main difference for the user is that the old 7777 and 7778 had separate inputs for VHF and UHF antennas. The new versions have a single combined all-channel input.
Our eyebrows were raised by the way CM marketed the new versions, by retaining the same model numbers as if to trade on the good reputation of the old pre-takeover versions. They also gave a lot less technical documentation for the new versions which sounded like marketing claims instead of engineering test results. This approach by PCT really turned us off to the point that we were reluctant to even suggest using the new versions because of the lack of reliable lab test results and the marketing approach that lacked the integrity that Channel Master previously had. As ADTech said, FUD was being demonstrated by PCT.
https://en.wikipedia.org/wiki/Fear,_...inty_and_doubt
After the CM redesign, Winegard also reduced their preamp line, so we have been forced to suggest CM preamps because there are now fewer good alternatives.