Links Duncan's Amp Pages.  Excellent source of infomation about all things tube. Can't live without these guys.   Antique Vintage Guitars Info - good source for dating vintage guitars Gorgeous site with info, pics and sound clips of National-Dobro instruments and amps Brad's Page of Steel.  Everything lap steel.

Lap steel site - some 30s and 40s amp pics


Pics and info on Rickenbacker Amplifiers

Paul Tutmark and the History of Audiovox
National, Dobro, Supro, Valco History: