TX audio stores in Austin or San Antonio?

In Austin for 5 days then San Antonio for 2. Any high end audio stores worth visiting? Guitar or CD stores too? Looking for a tube integrated.
I moved to Austin full time this past year, after several years of shuttling back and forth between NY and Austin. Frankly, at least compared to NY metro, high end retail here is fairly limited. There are a few good record stores, including the used bins at Waterloo if you hit it during the week, before they get picked over; End of an Ear and a couple of others.
The live music scene is very vibrant, as you probably know. You might want to check out the Continental Club on South Congress- Redd Volkaert is a regular there.
At C-Boys, a few blocks south, you can usually find the Mike Flanigin Trio featuring Jimmie Vaughan.
Another "Red" is Red Young, a monster B-3 player who is usually around, and if you look in the Chronicle, you’ll see who is playing where. Lot’s of venues right in town, though "dirty 6th"-- the strip near the Driscoll Hotel is more a college bar scene. Some friends own the Empire Control Room, which is a pretty serious venue for a range of music, from psych to hip-hop and everything in between.
We were at the "new" Antone’s last week to hear Billy Gibbons-- nice club.
Check out some of the eats.There’s some great food here- just avoid the weekend lines at the trendy places. Where are you coming in from?