[Harp-L] tube replacements

["Nick Kirkes" <nick.kirkes@xxxxxxxxx>]

Does anyone have some good recommendations for tube companies?  I have a
Blues Jr. on it's way to me and, following some tips I've read, I'd like to
swap the standard 12AX7 pre-amp tubes for 12AY7 tubes to cut down on
feedback.  I'll be using a new green bullet mic with the amp.
 
I saw someone mention groovetubes on this list, but I'd like to make sure
I'm not buying junk.  I just don't know enough about tubes and tube
manufacturers to make an informed decision on brand.
 
Thanks guys (and gals),
 
Nick