Many coils / transformers can be adjusted by eye or ears if
you have a good solid signal. Usually the convergence, horz osc, AFT,
sound IF, sound detector ( quad coil), 3.58 osc, burst, 41.25 & 4.5 traps.
The trick with coils is to flag your tool. Thats nothing but putting
a piece of tape on it so you can count the turns CW or CCW. That
way you can put them back if need be.
73 Zeno
LFOD !