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Olds Central
Dedicated primarily to Olds trumpets and cornets, but there's a lot of good stuff for any Olds fan.

Robb Stewart
I could just link to Robb's Olds page, but then you might miss all the other stuff. He adds a new article to his museum section almost every week.

Say what you like about living in the Los Angeles area, but there's some really great repair guys around here:
John Sandhagen/The Boneyard
John is located in Claremont, CA (a little over 20 miles east of downtown Los Angeles).

Bruce Belo
Bruce is located in Anaheim; sorry he doesn't have a website, but if you Google his name, his contact info is out there.

Robb Stewart
Robb is located in Arcadia, CA (near Pasadena).

Other Makes:
Contempora Corner
All things Reynolds.

The Conn Loyalist
Exactly what it says on the tin.

Sites of General Interest:
The Trombone Forum
Sage advice, spirited debate, bad jokes, and the occasional terrible pun.

Website and forum dedicated to gathering and disseminating information on all manner of antique, vintage, and obsolete brass instruments.