[MRCA] VRC-12 continued

[Ray Fantini]

Over the weekend had the opportunity to pull the 6100/6200 power amplifier from the RT-246 and removed the ten thousand little screws that secure the cover over the PA tube and its base. Everything looks very clean and did not see any issues but decided to clean the band switch S6202 and removed the 7843 PA tube but was not able to find any reason for the power dropping off. Did change the orientation of the PA tube being that's easy with those coaxial power tubes and after reassembly the radio puts out full power now. Go figure. Maybe it was a dirty PA band selector but it looked as clean as if it were new. I have had issues with this radio before with the band switch in the receiver front end needing to be disassembled and cleaned so maybe it's just the nature of these contacts that after years of not being used they oxidize or something. Lot like the problems that I have had with DC servo motors in radios like the GRC-106 sticking and needing just that little bit of attention to get them working again. If the problem reoccurs will be changing the PA tube for another and see if that fixes it.

Ray F/KA3EKH


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