Problem solved! I realized that there is a pot shaft on the rear of the amplifier marked Perc. Cutoff.
It was turned all the way left and caused the perc to be without decay. The more I turn it to the right, the more it shortens the perc. Brilliant!So, my M-3 is up and running! Her name is Nina. Now I only need an old Leslie to go with her. Thanks for all the help.Kalli