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. Maybe be the mode switch after all?

At TR41 and both test posts i could adjust the voltage at the outer leg of 41 while transmitting on AM by adjusting vr10 and get a volt reading from less than 1 volt up to about 7  but then sometimes it will show 13 volts at that leg and I can’t adjust it at all.  The inner leg consistently shows 6.5-6.8 and the center 13. So it’s intermittent.  Is that the mode switch issue you alluded to? But it was showing normal voltages at 41 at times but still there was no output.  Shouldn’t there have been when it was reading correctly?  Any other way to test it? And if it is bad where the heck would I find a new one?