Dynaco Company
This is another of my favorite companies. There are many good sites dedicated to the old Dynaco company, with many focused on vacuum tube equipment. A good general site is: http://home.indy.net/~gregdunn/dynaco. He's done a good public service in putting together all the information he has.
My interest in Dynaco focused on two pieces of equipment:
Stereo 120 Power Amplifier - restoring and improving this classic amplifier
AF6 AM/FM Tuner - Reviving this classic tuner
SCA 80 - A good integrated amp available for little $$