Off the air for a few days due to failure of the front mic input of my TS-870. I recently bought a used MC-80 and it seems that bad solderwork in the mic plug has shorted/fried the mic input. Input from the rear ACC connector (digi modes) works ok, so I suspect the AD822 op-amp in the front mic circuit is the culprit. Note to self; always inspect the cable and plug of a second hand mic.
UPDATE: Fixed the transceiver! Picture gallery of the operation here