Bass Lessons .com - the bass resource.
Posted by Bob 'Skippy' Blechinger on April 30, 2001 at 16:40:25:
In Reply to: bass and a guitar preamp posted by Toby Meyer on April 30, 2001 at 09:24:29:
: I'm running my 6-string bass into a Mesa/Boogie studio preamp (tube) and then into a standard bass amp (solid state). This sounds really good (very warm). But sometimes I hear some noise through the speaker, especially when I'm playing low notes (open B). It is some ringing sound. Do these low frequencies affect that (and can they damage the preamp's tubes) or do vibrations by the speaker cause that noise? Or are the tubes just too old (10-15 years)?
Right offhand, I'd say that part of the problem is that a guitar preamp isn't optimized for frequencies that low; it shouldn't make *all* that much difference, though. I don't think there's any serious possibility of damage from the low frequencies, especially given Mesa/Boogie's reputation for quality.
It's possible that the tubes have gone microphonic; if they're 10-15 years old, it's fairly likely that they could just be worn out, especially if they've been used a lot in that time.
I'd say that replacing your tubes would probably be a good idea at this point anyway, so go ahead and see if that solves the problem.
Hope that helps!
Post a Followup