I have tried some special buttons on IC706mkII:
Push TS and DISPLAY while power up and you will see a strange power on check.
Push P.AMP/ATT and RIT/SUB while power up and you will be able to see SHIFT-ADJ on your 706mkII. Dont know what this is for, recalibrating ?
I think that these things even works on the older version of 706, dont know.
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