Thank you so much Mal for that information and the pictures.and the offer of a variable Cap if I need one. I've just managed to get off the main metal lid of the VCO/PLL unit and am now confronted by that little metal box you mentioned. I may try to adjust the cap through the holes in the box, although the alignment is not great for accessing the adjusting screw head! One hole givese access to a test point so I will look that up.and see if I can measure anything at that point.
My "solder sucker" iron is not strong enough to tackle the metal lid solder so not sure how to proceed yet with that.
Kind regards
Peter G0LQU
