Off topic but I know there are some aviation techs on this list. I'm looking for a manual, or at a minimum the alignment instructions, for a General Electric air band VHF AM receiver Model # 4ERC-70-A3. I have one I want to change frequencies on and need the crystal calculation formula and the tune-up instructions. It looks a lot like one of the old GE ER-41-C VHF FM receivers from the Mastr Pro days. Thanks for any help and info.
Doug VE7DRF
