12AT7 in PI in a Marshall amp? What effect on tone?

  • Thread starter Thread starter redrol
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redrol

redrol

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Just curious, I have heard various people like to put these in the PI in Marshall amps. No idea what it might do to the tone however? :confused:
 
it didnt change the tone in mine. 2204 ish stuff. Something about Idle Current that I read from Myles Rose. Im leaving it in there. It just seems more immediate and focused.
 
interesting, so no adjustments needed, just put in a 12at7 in the pi? I know this is even remotely the same circuit, but I had a Mesa V-twin that sounded kinda grainy with 12ax7's - popped 12at7's in and it got real smooth.
 
Darren you going to be at NAMM? I have something for you to hear. Stop by Minarik
 
jerrydyer":2w36yxyt said:
Darren you going to be at NAMM? I have something for you to hear. Stop by Minarik
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yeah, I'll be there - and will do - what day?
 
I think IM taking friday off so Friday and saturday and sunday afternoon to pick up my stuff. I have a higher gain thing to show you, and one mod lets you knock off about 50% of your volume cranking the master so you get a saturated sound at bedroom or recording levels. Pretty cool. A little more agression and modern sounding.
 
jerrydyer":31yr1r6q said:
I think IM taking friday off so Friday and saturday and sunday afternoon to pick up my stuff. I have a higher gain thing to show you, and one mod lets you knock off about 50% of your volume cranking the master so you get a saturated sound at bedroom or recording levels. Pretty cool. A little more agression and modern sounding.
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cool!
 
I run an AT7 in my amp. THe tone is more glassy and dynamic; less saturated. But if you're using a ton of gain, you might not notice a huge difference.
 
Actually works well in the 6550 equipped amps. THe 12AT7 has lower gain, but more current drive. A 12AX7 is a little weak on drive for 6550's IMHO.
 
Carol-AnnAmps":vm8dws8b said:
Actually works well in the 6550 equipped amps. THe 12AT7 has lower gain, but more current drive. A 12AX7 is a little weak on drive for 6550's IMHO.
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Would that apply to EL34s too or does it not drive them the same as 6550s.
 
reviving an old thread, i'm interested in putting a 12AT7 in the PI of my TSL100... any reason against it?
 
There's no reason against it. It will knock the output down a bit. Try it and see if you like it.
 
steve_k":3nrkyjhh said:
There's no reason against it. It will knock the output down a bit. Try it and see if you like it.
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well i have read it has less gain, but can supply far more current than a 12ax7.. is this an issue for the power section or no? Has anyone tried this in a JCM2000 amp? I was thinking of doing it because it might sound better?
 
I run a 12AT7 PI in my Mesa. Huge improvement with that amp IMO. Fryette doesn't recommend it in my SigX so I gotta go with what they say. I'd check with amp manufacturer to be safe.
 
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