08-16-2013, 07:46 PM
Some of the IF adjusting nuts have B+ on them, that is if the 66 is much like the model 60. The metal in the nut driver won't affect the adjustment that much, no more then using a flat blade job on a typical 1940s IF transformer, the main reason Philco produced the fiber adjustment tools was because of the B+. The way I got around it was by wrapping the socket end or the nut driver with electrical tape.
Regards
Arran
Regards
Arran