Can I do that subs 12ax7 with 12at7 - diyAudio
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Old 24th June 2011, 10:18 AM   #1
tony Ma is offline tony Ma  United States
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Default Can I do that subs 12ax7 with 12at7

Hi all,

can I exchange for Pre-amp 12ax7 with 12at7?

tks
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Old 23rd July 2011, 06:49 AM   #2
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The two tubes have the same pinout and can be freely swapped in that sense.
However the gain of a 12ax7 is 100 whereas a 12at is spec'd as 60.
Also a 12ax drives about 1 ma whereas a 12at drives 10mA.

So put in an ax if you need more gain, an at if you need more current drive capability.
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Old 23rd July 2011, 10:19 AM   #3
SY is offline SY  United States
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Here's a crazy idea: if the circuit calls for a 12AX7, use a 12AX7. They aren't exactly hard to find, and excellent versions are relatively inexpensive.
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Old 24th July 2011, 10:04 PM   #4
DF96 is offline DF96  England
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Now you are being boring!
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Old 24th July 2011, 10:28 PM   #5
SY is offline SY  United States
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That is indeed my curse.
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Old 24th July 2011, 10:37 PM   #6
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Quote:
Originally Posted by SY View Post
Here's a crazy idea: if the circuit calls for a 12AX7, use a 12AX7. They aren't exactly hard to find, and excellent versions are relatively inexpensive.
Of course one of the very nice aspects of playing with tubes is that you can do stuff like that and its ok.
In the transistor world, not so much.
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Old 25th July 2011, 09:43 AM   #7
DF96 is offline DF96  England
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OK if you want an FX box, or the original design was wrong and just happens to better suit the 'wrong' triode. If the original design was correctly optimised for one triode, then putting another one in with completely different characteristics will give poorer performance.

Alternatively, just add a pot to fiddle with the bias and dial in whatever amount of distortion you prefer.
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