These are some of the places on the internet where I get my information and inspiration.
horn-u-copia.net: this site contains lots and lots of information about vintage brass manufacturers and has many pictures of their instruments.
brasshistory.net: this site has a lot of historical information about brass manufacturers that were active in the USA, but also some European.
Trent Hamilton: Trent is a YouTuber with mostly brass instrument related content ranging from serious performances including multi-tracks and solos, to educational videos about music theory, as well as a fair share of reviews, and the odd smattering of unusual instruments and joke content.
Brass from the Past: this is a YouTube channel that shows and lets you hear vintage brass instruments.
The Brass and Woodwind Shop: Art has been a professional band instrument repair technician for over 20 years and now makes videos for viewers on how they can repair their own brass or woodwind instrument.
The Conn Loyalist: This web site is for everyone who has a fondness for Conn instruments from the days when the C.G. Conn company was still located in Elkhart, Indiana. On this web site you will find information about Conn instruments.
Atelier Pfeiffer: this is where I bring my instruments for repairs I can not do myself.