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My tech in Quartzsite az favors that radio above all other modern ones. He kinda specializes in working on magnums. You could email him. He is fine tune electronics on the white list. There is a link there to his site.
I can't tell you exactly where the problem is.... I've never worked on one of these. But if they are similar to other ssb radios the rf final might have 2 different voltages. On some ssb radios the final will runn off of 8 volts in am mode and 12 volts in ssb mode. It might not be the case with this radio.
Check for voltage at the final in ssb mode.
Again I've never worked on one before so I'm not much help... but at least its something to check out. It certainly could be the problem.
Check it out I guess.......
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