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Author Topic: 12at7 for v2 adds definition - anyone else tried it?  (Read 9562 times)
Tone Control
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« on: September 30, 2010, 09:15:08 AM »
I like the 12ay7 in v1, using a 12ax7 would be unrewarding I suspect
But even so it's often mushy and there is little touch sensitivity.

I tried adding a 12at7 in v2
This improved things a lot I think, I can get a lot of different tones, with a little more definition.
The desirable sag is still there, and whacked up full there are better tones available (to my ears)
Note: I like the strat neck pickup the best, and this is improved a lot too with this extra change, although the bottom E string is still a bit louder than the other 5

Cheers
Tone
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Dr Tone Control, Strats mostly, prefer saturated clean tones, a little OD sometimes
BM50, JTM45, 36w EF86, DZ30, Expression, + non-Ceriatones (Matchless, Victoria, Wienbrock)
Just started with pedals a little after a 10 year purist spell, but usually just delay
sharp__edge
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« Reply #1 on: September 30, 2010, 02:22:23 PM »
i did consider changing the V2 tube for a 12AY7 in hope of getting similar results to what you described.


however, in the end, i realised i could keep the 12AX7 + 12AY7 configuration and still get definition by plugging into Mic or Instrument Input 2 (lower gain input).
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Tone Control
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« Reply #2 on: September 30, 2010, 07:00:22 PM »
hmm
I tried both with many settings,
the sound is very different on both with the at7

Cheers
Tone
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Dr Tone Control, Strats mostly, prefer saturated clean tones, a little OD sometimes
BM50, JTM45, 36w EF86, DZ30, Expression, + non-Ceriatones (Matchless, Victoria, Wienbrock)
Just started with pedals a little after a 10 year purist spell, but usually just delay
wyatt
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« Reply #3 on: September 30, 2010, 11:01:23 PM »
Just to note, the belief that all 12A*7's are interchangeable is a myth.  The 12AU7 and the 12AT7 don't have the correct internal resistance to work correctly in most 12AX7 situations (phase splitting PI designs being a be exception).

Now the 5751 was specifically designed to repalce a 12AX7 with a gain rating of 70mu (similar to a properly biased 12AT7)
« Last Edit: September 30, 2010, 11:03:43 PM by wyatt » Logged
Tone Control
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« Reply #4 on: October 01, 2010, 10:05:56 AM »
I've been following the advice from this page: http://thetubestore.com/gainfactor.html
Please tell me if there is any mistakes there

A 5751 might sound better then?
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Dr Tone Control, Strats mostly, prefer saturated clean tones, a little OD sometimes
BM50, JTM45, 36w EF86, DZ30, Expression, + non-Ceriatones (Matchless, Victoria, Wienbrock)
Just started with pedals a little after a 10 year purist spell, but usually just delay
Tone Control
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« Reply #5 on: October 11, 2010, 07:16:08 AM »
I'm sticking with the change for now
The sound is very different to just reducing volume onthe amp or guitar or using a lower-sensitivity input
The amp sounds less muddy, and the saturation is more subtle, more dependent on my playing rather than "on all the time"

personal taste though, but I always like to have the touch of my fingers determining the tone

Cheers
Tone
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Dr Tone Control, Strats mostly, prefer saturated clean tones, a little OD sometimes
BM50, JTM45, 36w EF86, DZ30, Expression, + non-Ceriatones (Matchless, Victoria, Wienbrock)
Just started with pedals a little after a 10 year purist spell, but usually just delay
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