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Channel Master CM-7775, CM-7777, CM-7778 Pre-Amplifier Installation Instructions The presence of important operating and maintenance instructions are CM-7777 CM-7778 Troubleshooting; Also see attached diagrams at the Over-tightening will damage the Printed Circuit Board and render the preamp useless. performing the troubleshooting steps above, please contact Channel Master 13 hours ago -Product Overview. The Channel Master TITAN 2™ CM-7777 preamplifier is a high gain, low noise preamplifier used for weak signal areas. The CM-7777 takes a Find helpful customer reviews and review ratings for Channel Master CM-7777V3 Titan 2 High Gain TV Antenna Preamplifier [Version 3] at Amazon.com.