Dad's Photography Equipment

My dad passed away in June. He was a projectionist and left all kinds of equipment, from TV tubes, (maybe even a tube from the 1950 threatre) old cameras, projectors, a pull-down home movie screen and a velbon px 781 tripod. We even have several cansters wtih movies, movies on the large discs, stereos, speakers and mikes.

My dad was 91 and had been in the movie industry since he was around 16 years old.

He was also into electronics, since he was an electronic's mate in the Navy during WWII.

Mom and I would like to know where to begin to sell most of this equipment. We want put to good use.

Can anyone give us any ideas?