The Tektronix 7904 was a 500 MHz 7000 Series mainframe oscilloscope produced from 1971 to 1984. It takes two horizontal and two vertical plug-ins. It was replaced by the redesigned 7904A which was produced from 1984 to 1990.
These audio files are meant to be used in conjunction with the 7904 schematics. Each part is approximately 30 minutes so the complete circuit description is 4 hours. We have extracted the schematics from the 070-1195-02 manual into a 12 page PDF document to be used with these audio files although we do not know the organization of the schematics for these descriptions.
7904 Circuit Description Part 1
7904 Circuit Description Part 2
7904 Circuit Description Part 3
7904 Circuit Description Part 4
7904 Circuit Description Part 5
7904 Circuit Description Part 6
7904 Circuit Description Part 7