Huw10 Posted June 17, 2009 Share Posted June 17, 2009 just used my new (second hand) mesa for the first tiome in practice and it didn't go so good. Was just delivered on Monday. The issue: left it for a good 7-8 mins to warm up then took it off stand by. messed around with the settings a little then we started playing a tune. 3 notes in it cuts out. checked the fuse and it was blown... replaced this fuse. Second time, pretty much exactly the same. Waited less time before taking it off standby though coz the tubes were already warmed up. Replaced the fuse. switched to the other output jack. Third time struck the first note before even playing a song and blew another fuse. Was using it with an 8ohm trace elliot cab out of one of the 8 ohm jacks? is this correct? Can anybody help me with trouble shooting this problem as i've got a gig tomorrow and i'd really like to play it. My thoughts are that i could be loose tubes or the wrong output jack? can anybody help plese? Quote Link to comment Share on other sites More sharing options...
umph Posted June 17, 2009 Share Posted June 17, 2009 when was it last revalved? Quote Link to comment Share on other sites More sharing options...
onehappybunny Posted June 18, 2009 Share Posted June 18, 2009 Suggest it's worth checking out firstly what amp fuse was used in it - think you need an 8amp slow blow fuse. If that's still blowing there must be some other problem Quote Link to comment Share on other sites More sharing options...
tayste_2000 Posted June 18, 2009 Share Posted June 18, 2009 Sounds like a valve has gone to me Quote Link to comment Share on other sites More sharing options...
tayste_2000 Posted June 18, 2009 Share Posted June 18, 2009 I have some spare matched EHX tube taken from my 400+ months ago I could get some out tomorrow if you are really in need Quote Link to comment Share on other sites More sharing options...
chris_b Posted June 18, 2009 Share Posted June 18, 2009 Are you sure that it's an 8 ohm cab? If you retube you'll need to rebias the amp which is not something I'd attempt! Sounds like you need an amp tech. The Boogie distributer is Westside, in Glasgow. They should be able to help. Quote Link to comment Share on other sites More sharing options...
riff raff Posted June 18, 2009 Share Posted June 18, 2009 something similar was happening with mysvt cl.turned out to be a faulty valve socket. Quote Link to comment Share on other sites More sharing options...
Geddys nose Posted June 18, 2009 Share Posted June 18, 2009 Sounds like a Power Tube problem to me, The Mesa has a fixed bias so make sure you tell the Shop what its for before buying 'just any' 6l6. Quote Link to comment Share on other sites More sharing options...
Noisyjon Posted June 18, 2009 Share Posted June 18, 2009 (edited) [quote name='chris_b' post='517402' date='Jun 18 2009, 02:08 PM']...If you retube you'll need to rebias the amp which is not something I'd attempt!...[/quote] In the Bass 400+ manual it says "Amplifier bias has been permanently set at the factory and should never need adjustment" That should help to make things a little easier! edit:quote correction Edited June 18, 2009 by jonthebass Quote Link to comment Share on other sites More sharing options...
Huw10 Posted June 18, 2009 Author Share Posted June 18, 2009 Thanks for all the help people. Was a dodgy valve. Just pulled it out. Sounded fine. Thanks again, really appreciated. Quote Link to comment Share on other sites More sharing options...
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