Quote Originally Posted by Altec Best View Post
GM if they been face down without any kind of rotation for 41 years.I guarantee they will need to be reconed.
No argument and why I've periodically set them outside face up on concrete on a bright, hot, Summer day till they bottomed out, then drove them a bit with a ~Fs sine wave for awhile before storing them face up for awhile until the old Heathkit died some years ago. Anyway, got it fixed last week enough to work, though I doubt it's all that accurate now, but good enough to work the 421s once it gets hot enough outside and hopefully the ~seven years I've only rotated them in the closet was enough to keep them from needing a re-cone. If not, I'll sell them as is and they will be just one more thing I held onto for too long in a 'penny wise, pound foolish' way.

GM