Can I use a 12AX7 with CT 6.3V? - diyAudio
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Old 27th February 2011, 06:44 PM   #1
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Default Can I use a 12AX7 with CT 6.3V?

How do you wire it?
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Old 27th February 2011, 06:47 PM   #2
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Yes, one end to pins 4&5 (tied together) and the other end to pin 9.

TDSL Tube data [12AX7]
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Old 27th February 2011, 07:05 PM   #3
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Thanks Scott,

Would it be the same for a 6N2P?
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Old 27th February 2011, 07:42 PM   #4
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Quote:
Originally Posted by Troncones View Post
Thanks Scott,

Would it be the same for a 6N2P?
No. The 6N2P is wired to have 6.3v on pins 4/5.
Irritating because it would be nice to be able to swap the two types for listening comparison.

Gary
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Old 28th February 2011, 01:36 PM   #5
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if one of your heater winding is grounded .
you could end up whit
12ax7
pin 4 +6.3v you shouldnt tie these together .
pin 5 +6.3v
pin 9 ground

use a switch witch is a 2 position 1 pole . ( dual if your using two 6n2p )
to switch pin4 on the 6n2p
6n2p
pin 4 ground
pin 5 + 6.3v
pin 9 ground . this does NOT matter as its only a shield and its not connected to any further elements in the tube .
in this way you could use both
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Old 28th February 2011, 07:01 PM   #6
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Thanks v4lve,

I will try this when I get my other Tx. The one I'm using for the test build only has 3.15-0-3.15.
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Old 28th February 2011, 07:11 PM   #7
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it does not matter if its center-tapped . if im correct . if someone thinks im wrong please correct this .
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Old 28th February 2011, 07:49 PM   #8
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12AX7 requires 6.3V (or 12.6V). 3.15-0-3.15 is 6.3V CT. You need 6.3V, you have 6.3V - so no problem.
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Old 1st March 2011, 04:05 AM   #9
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With the 6N2P how can you put 6.3 on pin 5 using CT 6.3V?
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Old 1st March 2011, 11:10 AM   #10
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I don't understand the question. Heaters are almost always about the voltage beween two pins, not the voltage on one pin. (minor exceptions are those valves which tie one side of the heater to the cathode, like some beam deflection mixers). You need 6.3V, you have 6.3V. What is the problem?
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