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Discussion Forum for Mesa Boogie Products
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PostPosted: Wed Oct 26, 2016 6:03 pm 
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Mark II

Joined: Sat Mar 15, 2014 7:56 am
Posts: 133
When i first got the amp (new) about 2 months ago, i did notice that if i tapped the front of the amp where the knobs are,it sounded like i was tapping the tubes and they were about to go into self oscillation.Pretty much the classic sound of a microphonic tube.Was recording in the studio earlier and noticed some weird rattles coming in on certain notes on the E string.Pretty sure its a bad tube or 2.Just wondering if anyone else Royal makes a similar sound when they tap the front gently.Im gonna swap a few tubes out tomorrow anyway to be sure.Cheers


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PostPosted: Sun Oct 30, 2016 7:55 pm 
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Dual Recto

Joined: Fri Feb 22, 2013 7:31 am
Posts: 2095
Location: North Carolina
The only rattles I have gotten were from the power tubes. The small bottle and some of the larger variants do make noise. I have a set of Mullards in my RA100 combo that do not make any noise at all except for what I hear from the speakers, and that would be me making the noise.

Sounds like you may have a preamp issue. What channel does it affect?

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PostPosted: Mon Oct 31, 2016 6:10 am 
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Mark II

Joined: Sat Mar 15, 2014 7:56 am
Posts: 133
All sorted.Was actually the fx loop tube in the end.Cheers


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