[RadioSvit]

Michael, all pre-war intermediate frequency transformers Telefunken used ferrite cores with a very interesting feature - they can be adjusted both from the bottom of the chassis and from above. And on one side of such a core was 6-sided, and on the other - for a flat screwdriver. Look at the IF transformer from above, there may be direct access to the ferrite core from above. It may be necessary to remove the screen from the IF transformer.