the schematics the B+ runs through the coil in the filter, short the B+ to
ground and you are out 1 filter.
Similar to the earlier 75A4's I believe. Just harder to
Ask Howard Mills, W3HM. I never heard of this before on
a J-4. If it was necessary I'm sure Howard has a good way to do it or would at
least know the in's and out's.
73, Russ WQ3X