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Old 31st May 2008, 10:48 PM   #1
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Default 12ax7

I have seen a few comments on the 12ax7 being good for a guitar pre amp due to its warm sound.

Does anyone have a cct digram for a pre amp using this device ?

Some none linearity in the design to fatten up the sound would be good.

Thanks in advance, NIgel
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Old 31st May 2008, 10:55 PM   #2
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The 12AX7 is probably the most common preamp valve in guitar amps today. All popular amplifier designs use them, so it's impossible to pick just one to give you. It all depends on what your preferences are. Here is a good starting point for guitar amp schematics. Just look up some of your favorite amps or the amps of your heroes.
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Old 31st May 2008, 11:29 PM   #3
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Quote:
Originally posted by AmpKiller66
The 12AX7 is probably the most common preamp valve in guitar amps today. All popular amplifier designs use them, so it's impossible to pick just one to give you. It all depends on what your preferences are. Here is a good starting point for guitar amp schematics. Just look up some of your favorite amps or the amps of your heroes.

The Vox AC30 front end looks promising.

Many thanks........
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Old 1st June 2008, 12:36 AM   #4
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Quote:
Originally posted by nigelwright7557



The Vox AC30 front end looks promising.

Many thanks........

Someone also sent me this link.

http://www.google.co.uk/imgres?imgur...&ct=image&cd=1
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Old 1st June 2008, 06:06 AM   #5
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Quote:
Originally posted by nigelwright7557
Someone also sent me this link.

http://www.google.co.uk/imgres?imgur...&ct=image&cd=1
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Old 1st June 2008, 12:35 PM   #6
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Quote:
Originally posted by nigelwright7557
Someone also sent me this link.

http://www.google.co.uk/imgres?imgur...&ct=image&cd=1
I agree with Tubes4e4 that the output load is not ideal in that circuit. What does the feedback from the output valve anode to the input valve cathode do to the output impedance, though?
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Old 1st June 2008, 02:54 PM   #7
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Quote:
Originally posted by tubewade


I agree with Tubes4e4 that the output load is not ideal in that circuit. What does the feedback from the output valve anode to the input valve cathode do to the output impedance, though?

I have altered the cct drastically just to use the first half of the valve. The second stage is no longer used.
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