Here are some links contributed by friends and visitors to this site...
Madisound's site for speaker parts
The Morel Co., for some speaker replacement
parts
Audio Related Internet, World Wide Web & FTP Sites
Douglas Self's article on subjective evaluation
This link includes a reference to David Hafler's "Straight wire differential test".
NTE
Seminconductor's Transistor Cross Reference
Downloadable documents
containing cross-reference data
Peavey's
transistor cross reference document
UNL's EE site - tons
of great electronics links
The Audio Circuit - Great info on
audio esoterica
BobbyShred's Infinity Speakers page