Does anyone know who made this?
This is the only marking on it. These are what were in my F2B when I got it. I bought some Chinese Groove Tubes to replace them, but these sound noticeably better. Much tubier.
(http://club.alembicguitars.net/Images/449/43780.jpg)
Thanks,
Charles
Looks to me like late 80's/early 90's Chinese, which do indeed sound better than current Chinese, IMO.
Thanks, Kent!