Measurements of an undisturbed, good and properly adjusted L2 in an SE-30 (with yoke plug disconnected, of course): 25 uH.
This unit has a black core, 1 inch long; .6 inches remain outside the copper winding area and .4 inches are inserted into the winding area that is about .550 inches long.
This unit has a black core, 1 inch long; .6 inches remain outside the copper winding area and .4 inches are inserted into the winding area that is about .550 inches long.