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I bought a Yaesu FT-890 it was way off frequency as that particular vintage would do.

There was a bad capacitor in the local reference oscillator. The SWR meter was way out too. After spending a lot of time doing the alignment I was sick of looking at the internals of this radio and almost did not try to fix the SWR meter.

I did take the a time after taking a break. The procedure required three resistors to set the meter with 50 ohms being the center point of the calibration and 75 ohms being used to set the 2:1 range. It works perfectly and I test it every now and then to be sure.