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 Post subject: 12ax7 of 12at7 in p1
PostPosted: Wed May 04, 2011 10:58 am 
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Mark I

Joined: Fri Mar 11, 2011 5:32 pm
Posts: 36
hi boogie owners i have an f50 and was looking at swapping out the 12ax7 in p1 for a 12at7 what are the pros and cons?
i have heard it macks the amps sound more open but i have also heard it is less dynamic?
cheers andy


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 Post subject: Re: 12ax7 of 12at7 in p1
PostPosted: Wed May 04, 2011 5:34 pm 
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Single Recto

Joined: Sat Dec 05, 2009 1:07 pm
Posts: 1340
I would say it makes it more dynamic, not less. It does reduce gain a bit - so if your idea of 'dynamic' is "as loud as possible" then it does reduce that - but my idea of dynamic is "more responsive to changes in technique, guitar volume and pedal settings". It also widens the tone and makes it deeper, clearer and less midrangy.

I've put 12AT7s in the PI in every Mesa I've ever owned, and some for friends and customers, and it has (in my opinion) improved every one of them. Perhaps if I was looking for all-out rock/metal tones I would think otherwise, but I'm not.


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 Post subject: Re: 12ax7 of 12at7 in p1
PostPosted: Wed May 04, 2011 5:45 pm 
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Mark III

Joined: Sun Feb 28, 2010 9:31 pm
Posts: 231
Location: cheeseland
It certainly can't hurt anything to give it a try - its on my tube roll list of possibilities.

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Me -------> 1973 Gibson Les Paul Standard------->1991 Mesa Boogie Mark IVa/b Combo -------> World.


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 Post subject: Re: 12ax7 of 12at7 in p1
PostPosted: Wed May 04, 2011 9:02 pm 
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Mark IV

Joined: Mon Jul 06, 2009 11:20 pm
Posts: 687
Location: Desert
I put 12AU7's in the first and third positions of my Express. I don't like the amp with the 12AX7's in all positions. The amp is a LOT less compressed now. Absolutely pleasant

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 Post subject: Re: 12ax7 of 12at7 in p1
PostPosted: Thu May 12, 2011 10:50 am 
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Mark II
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Joined: Sat Aug 21, 2010 12:15 pm
Posts: 116
mullard cv4024 is a good tube to tame things on the gain side, but improve clarity and color.


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 Post subject: Re: 12ax7 of 12at7 in p1
PostPosted: Mon May 16, 2011 7:42 am 
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Mark IV

Joined: Fri Oct 05, 2007 11:39 am
Posts: 755
Location: Park City, UT
+1 for cv4024.

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